{ "title": "HVEPS run-level input and measurement availability", "version": 4, "prepared": "2026-10-04", "purpose": "Show which source-reported HVEPS Test 3 quantities are measured, post-test reconstructed, or absent from the retained report. This is a boundary and data-availability ledger, not a new experiment or a net-efficiency calculation.", "source": { "reference": "Lineberry et al., HVEPS Scramjet-Driven MHD Power Demonstration Test Results, AFRL-PR-WP-TP-2007-233, preprint, June 2007", "record": "https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/ADA471429.xhtml", "doi": "https://doi.org/10.2514/6.2007-3880", "local_source_sha256": "58BBB34829C30439F3D6AA1AC27E31430C01657DEF5E1F29F959598B4EE734BB", "locators": { "test_3_summary": "Table VI, printed p. 27 / PDF p. 29; visually inspected", "electrical_traces": "Figures 16-18, printed pp. 16-17 / PDF pp. 18-19; Figure 27 printed p. 26 / PDF p. 28 explicitly labels Run 3 as Test No. 3", "seed_flow_limitation": "Printed p. 21 / PDF p. 23", "test_sequence": "Table IV, printed p. 12 / PDF p. 14", "figure18_timebase": "Figure 18 x-axis printed p. 17 / PDF p. 19 (19-23 s); Table IV printed p. 12 / PDF p. 14 gives a nominal three-second MHD-generation hold; report does not explicitly crosswalk these time origins." }, "retrieval_limit": "The official NTIS/NTRL ADA471429 record served a 32-page PDF (2,218,716 bytes; SHA-256 CCBC90C0BC0626328B058023D153D2F268767F85DAFD8BFD2A0DBFFACCFA1521). The printed p. 27 / PDF p. 29 Table VI was visually compared side by side with the retained third-party indexed copy; the displayed rows match, including Test 3 low/mean/high combustion-efficiency cases. The two files are not byte-identical. The third-party color copy remains the basis for existing figure crops; The official p.18 visual cross-check also compares Figures 16 and 17 with the retained third-party copy: titles, axes, captions, time windows, principal waveforms, and the prominent approximately 32.2 s current spike correspond. Rendering/background colors differ. This is not pixel identity or point-by-point digitization, and does not clear reuse rights. cite the official NTRL-hosted copy for report identity and checked Table VI values. No machine-readable raw test telemetry, synchronized Test 3 species flow, or complete electrical calibration/uncertainty package was located in this report. Primary-source crosswalk follow-up confirms Run 3 = Test No. 3 / UTRC 213.3 from Table V and Figure 27; see analyses/hveps-run3-test3-crosswalk-primary-source-followup-2026-10-04.md. Figure 18 / Table VI cross-check is bounded: the graph axis ends at 6 kW, Table VI reports 6.52 kW (internally consistent with 57.82 A at 1.95 ohm), and exact raw sample indices/time-origin reconciliation is not published. Figure 18's 19-23 s axis is not explicitly tied to Table IV nominal three-second generation hold.", "official_bibliographic_record": "https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/ADA471429.xhtml", "retained_copy_access_record": "https://dtic.minsky.ai/index/ADA471429", "official_pdf_sha256": "CCBC90C0BC0626328B058023D153D2F268767F85DAFD8BFD2A0DBFFACCFA1521", "official_pdf_bytes": 2218716, "official_pdf_pages": 32, "copy_comparison": { "retained_third_party_sha256": "58BBB34829C30439F3D6AA1AC27E31430C01657DEF5E1F29F959598B4EE734BB", "official_ntis_ntrl_sha256": "CCBC90C0BC0626328B058023D153D2F268767F85DAFD8BFD2A0DBFFACCFA1521", "byte_identical": false, "common_report_identity": "Both 32-page files bear the same report title, AFRL-PR-WP-TP-2007-233 number, authors and ADA471429 accession.", "direct_visual_check": "Side-by-side comparison of printed p. 27 / PDF p. 29 (Table VI); all displayed rows, including the three Test 3 combustion-efficiency cases, match. The official p.18 visual cross-check also compares Figures 16 and 17 with the retained third-party copy: titles, axes, captions, time windows, principal waveforms, and the prominent approximately 32.2 s current spike correspond. Rendering/background colors differ. This is not pixel identity or point-by-point digitization, and does not clear reuse rights.", "selected_test3_values_match": true, "scope_limit": "Table VI and physical PDF p.18 Figures 16-17 were visually compared, but not every report page or every pixel/trace value; this is not raw-data digitization and does not establish image reuse rights." } }, "test_3": { "date_as_printed": "11/12/06", "peak_magnetic_field_T": 1.48, "load_dump_resistance_ohm": 1.95, "load_current_A": 57.82, "combustion_efficiency_percent": 89, "combustion_efficiency_case": "mean; Table VI also shows 81.5% low and 96.5% high cases", "reported_load_bank_dissipation_kW": 6.52, "post_test_active_channel_output_kW": 14.38, "post_test_matched_load_maximum_kW": 14.8, "power_generation_interval_seconds": 3, "matched_load_cases": [ { "combustion_efficiency_percent": 81.5, "case": "low", "load_bank_dissipation_kW": 6.52, "active_channel_output_kW": 14.38, "matched_load_maximum_kW": 15.98 }, { "combustion_efficiency_percent": 89, "case": "mean", "load_bank_dissipation_kW": 6.52, "active_channel_output_kW": 14.38, "matched_load_maximum_kW": 14.8 }, { "combustion_efficiency_percent": 96.5, "case": "high", "load_bank_dissipation_kW": 6.52, "active_channel_output_kW": 14.38, "matched_load_maximum_kW": 15.19 } ], "matched_load_cases_scope": "Table VI post-test load-line analyses; the 15.98/14.80/15.19 kW values are calculated matched-load maxima at the low/mean/high combustion-efficiency cases, not measured load-bank outputs." }, "consistency_checks": [ { "check": "load_current_squared_times_selected_resistance", "equation": "I^2 R", "inputs": "57.82 A and 1.95 ohm from Table VI", "calculated_kW": 6.5191, "reported_kW": 6.52, "interpretation": "Agrees to table rounding; this checks arithmetic consistency only, not meter calibration or uncertainty." } ], "quantities": [ { "id": "trace_run_number_crosswalk", "quantity": "Mapping between figure trace labels and Table VI test numbers", "status": "crosswalk_established", "reported": "Figure 16 is explicitly Test No. 1 raw terminal voltage/current. Figure 18 shows filtered 1 kHz DAQ and 50 Hz Fluke load-dump power labelled Run 3. Table V maps Test No. 3 to UTRC 213.3; Figure 27 co-labels RUN 3 – Bmax = 1.48 and Test No. 3 Data.", "source_locator": "Table V printed p. 13 / PDF p. 15; Figure 18 printed p. 17 / PDF p. 19; Figure 27 printed p. 26 / PDF p. 28; Table VI printed p. 27 / PDF p. 29", "remaining_gap": "Raw synchronized Test No. 3 voltage/current files, channel map, calibration/uncertainty records, and matched flow/support-power/force records.", "relevance": "The Figure 18 graph-read power integral can be attributed to the Test No. 3 campaign point, but remains approximate load-dump dissipation; it is not raw telemetry, independent validation of the separate Table VI summary, net vehicle-bus power, or thrust." }, { "id": "figure18_tablevi_power_comparison", "quantity": "Figure 18 trace versus Table VI Test No. 3 load-bank point", "status": "not_exactly_reconciled", "reported": "Table VI reports 6.52 kW for 57.82 A at 1.95 ohm; I^2R = 6.519 kW, consistent with table rounding. Figure 18 is graph-read with a 0-6 kW vertical axis and cannot independently verify 6.52 kW exactly. The report says post-test analysis averaged 100 filtered 1 kHz samples from a subjectively selected maximum-power region; exact indices are not published.", "source_locator": "Figure 18 printed p. 17 / PDF p. 19; Table VI printed p. 27 / PDF p. 29; post-test sampling description printed p. 17 / PDF p. 19. Table IV nominal 3-second hold: printed p. 12 / PDF p. 14.", "remaining_gap": "Raw synchronized DAQ and exact sample indices/window; the Figure 18 19-23 s time origin is not linked to Table IV nominal 3-second hold.", "relevance": "Keep Table VI I2R arithmetic, graph-read trace and 3.9-second integral distinct. Do not call them an exact numeric mismatch or reconciliation, and do not treat the 3.9-second integral as energy over the nominal 3-second hold." }, { "id": "load_bank_electrical_output", "quantity": "Power dissipated in the external resistive load bank", "status": "reported_measured_operating_point", "reported": "6.52 kW for Test 3 mean row; 57.82 A at 1.95 ohm", "source_locator": "Table VI, printed p. 27 / PDF p. 29; Fig. 18, printed p. 17 / PDF p. 19", "remaining_gap": "The retained report provides plots and reduced values, not the synchronized original telemetry files or a complete independent calibration and electrical uncertainty package.", "relevance": "This is the clearest directly reported external electrical output for the selected load. It is not net aircraft-bus power." }, { "id": "active_channel_power", "quantity": "Output across the central active generator channel with end-region losses excluded", "status": "post_test_derived", "reported": "14.38 kW for Test 3", "source_locator": "Table VI note 2, printed p. 27 / PDF p. 29; printed pp. 19–21 discuss Hall-field reversal and end losses", "remaining_gap": "It is a post-test estimate and not the load-bank measurement. Raw spatially resolved data and a complete uncertainty treatment are not supplied as a data package.", "relevance": "Useful for understanding generator-channel behavior; cannot be substituted for bus-delivered power." }, { "id": "matched_load_maximum", "quantity": "Maximum power potential at matched load", "status": "post_test_model_estimate", "reported": "14.80 kW for Test 3 mean row", "source_locator": "Table VI note 3, printed p. 27 / PDF p. 29; post-test load-line analysis", "remaining_gap": "The value is calculated from post-test load-line analysis, not a directly measured operating point.", "relevance": "Do not describe it as the electrical power actually dissipated in the tested load bank." }, { "id": "seed_mass_flow", "quantity": "NaK ionization-seed flow during the power interval", "status": "not_directly_measured", "reported": "The test procedure specifies a calibrated target and the report discusses an intended seed fraction; the authors explicitly state that no direct measurement of the NaK flow rate was made.", "source_locator": "Printed p. 21 / PDF p. 23", "remaining_gap": "Actual time-aligned NaK mass flow, injector plugging/drift and resulting seed fraction for Test 3.", "relevance": "Seed rate affects plasma conductivity and interpretation of generator power; the source itself says the possible effect was not quantified." }, { "id": "synchronized_reactant_mass_flow", "quantity": "Air, oxygen, hydrogen and fuel flow aligned to the selected electrical samples", "status": "partly_reported_setpoints_no_machine_readable_sync_bundle", "reported": "Table II gives calculated targeted-operation flows (including 0.595 kg/s air and 0.038 kg/s NaK seed across its 75%, 85% and 95% combustion-efficiency columns). Table III lists MHD demonstration-series set conditions (2.83 lbm/s air, 0.35 lbm/s ethylene, 3.18 lbm/s air+fuel, and 0.085 lbm/s NaK); its separate March 2006 Run 195.1 baseline box lists 1.32 pps air, 1.48 pps O2, 0.0705 pps H2, and 0.35 pps ethylene. The source says the baseline did not include NaK. These values are not synchronized actual Test 3 species-flow measurements.", "source_locator": "Table II, printed p. 9 / PDF p. 11 (calculated target, visually inspected); Table III, printed p. 11 / PDF p. 14 (MHD test set plus separate March 2006 baseline, visually inspected); selected power samples: Table VI, printed p. 27 / PDF p. 29", "remaining_gap": "Timestamp-aligned calibrated species flow and exact mass crossing the selected generator control surface during Test 3 power window. Target and separate baseline flow values cannot be substituted for that missing time-aligned record.", "relevance": "These source values prevent an apparent omission from being mistaken for matched Test 3 flow data. Without a flow synchronized to the power samples, no defensible Test 3 kW-to-kJ/kg normalization is established." }, { "id": "power_uncertainty_and_calibration", "quantity": "Calibration and uncertainty for the reported electrical power", "status": "not_complete_in_retained_report", "reported": "The source describes 1 kHz DAQ traces, 50 Hz Fluke readings, filtering, and averaging; Table VI gives ±7.5% accuracy for combustion-efficiency calorimetry.", "source_locator": "Figures 16–18, printed pp. 16–17 / PDF pp. 18–19; Table VI note 1, printed p. 27 / PDF p. 29", "remaining_gap": "Traceable calibration certificates, voltage/current uncertainty and covariance, filtering sensitivity, and propagated uncertainty for each power value.", "relevance": "The calorimetry accuracy does not provide an uncertainty bar for generator electrical output." }, { "id": "support_power_and_heat", "quantity": "Magnet, seed-system, conditioning, controls, cooling and rejected-heat inputs on a common boundary", "status": "not_closed_as_system_balance", "reported": "The report describes the test rig, magnet, seed injection, heat-sink channel and purge/cooling sequence as separate facility operations.", "source_locator": "Test sequence, Table IV, printed p. 12 / PDF p. 14; report sections on facility and post-test analysis", "remaining_gap": "Synchronized electrical/thermal input and output for all support systems, plus an agreed control volume and uncertainty budget.", "relevance": "The reported generator output is not net system electricity or evidence of a self-sustaining loop." }, { "id": "accelerator_and_vehicle_force", "quantity": "Downstream accelerator input/output, nozzle force and vehicle thrust", "status": "not_tested_in_hveps_report", "reported": "The HVEPS record covers a combustor-driven MHD generator component on a ground rig.", "source_locator": "Report scope and test arrangement; Test 3 results, Table VI", "remaining_gap": "A matched generator-to-accelerator cycle, measured thrust and installation/vehicle drag under shared inlet and exhaust planes.", "relevance": "HVEPS demonstrates component generation under its rig conditions, not an integrated propulsion benefit." } ], "minimum_follow_on_measurement_package": [ "Timestamp-aligned calibrated flow of air, fuel, oxygen and NaK seed across the same power interval.", "Raw synchronized channel voltage/current, electrode voltage distribution, load resistance and calibration records.", "Magnet, seed injector, power-conditioning, control and cooling system input power, plus heat rejected or stored.", "Station-resolved pressure, temperature, velocity, composition and mass flow at matched inlet and outlet planes.", "If vehicle benefit is claimed: an accelerator, nozzle, thrust measurement, installation mass/drag, matched baseline and propagated uncertainty." ], "interpretation": "The HVEPS report supports a short-duration ground-test MHD generator component result. It does not close a common-boundary net electrical balance, a generator-to-accelerator loop, or vehicle thrust. Missing fields describe this retained report and bounded source check, not proof that no data exist elsewhere.", "published_flow_evidence": { "targeted_operation": { "evidence_class": "calculated target, not measured test flow", "table": "Table II", "printed_page": 9, "pdf_page": 11, "conditions": { "combustion_efficiency_percent": [ 75, 85, 95 ], "air_flow_kg_s": 0.595, "nak_seed_flow_kg_s": 0.038, "preheater_h2_flow_kg_s": 0.031, "scramjet_fuel_ethylene_flow_kg_s": 0.16, "total_throughput_kg_s": 1.483 }, "method_note": "The report says Table II was generated using PWR RASCAL and LyTec thermochemical calculations." }, "demonstration_test_set": { "evidence_class": "set conditions for the MHD demonstration series; not synchronized Test 3 telemetry", "table": "Table III", "printed_page": 11, "pdf_page": 14, "flows": { "air_lbm_s": 2.83, "ethylene_lbm_s": 0.35, "total_air_plus_fuel_lbm_s": 3.18, "nak_seed_lbm_s": 0.085 }, "nak_table_note": "0.085 lbm/s is marked as 3% of air in the table; nearby prose says about 2.5% of total flow during the MHD tests." }, "separate_baseline": { "evidence_class": "separate pre-demonstration baseline run", "run": "Run 195.1, completed March 2006", "table": "Table III right-hand baseline box", "printed_page": 11, "pdf_page": 14, "flows_pps": { "air": 1.32, "oxygen": 1.48, "hydrogen": 0.0705, "ethylene": 0.35 }, "nak_seed_injected": false, "source_note": "The report states baseline tests did not include NaK seed injection, whereas MHD demonstration tests used seeding." }, "interpretation": "The report contains target, MHD-test-set and separate baseline flow information, but it does not supply timestamp-aligned actual Test 3 species flow matched to the Table VI electrical-power samples. Do not treat the target or baseline entries as Test 3 measurements and do not normalize the Test 3 kW values by them to claim specific energy." }, "related_publications_file": "hveps-related-publications.json", "related_publications_note": "The separate AIAA 2007-4015 computational-analysis paper has bibliographic metadata, but its full text and reproducible input/output data were not located. It does not independently authenticate the retained HVEPS test-report PDF or resolve missing synchronized Test 3 inputs." }