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outlets open" } ], "heat_exchanger_bypass_retest": [ { "speed_kmh": 100, "unobstructed_bypass_mass_flow_kgs": 4.325111147955062, "warm_HX_mass_flow_kgs": 4.031206086708733, "cold_HX_mass_flow_kgs": 4.107484650149052, "cold_installed_HX_change_from_bare_bypass": -0.050316972295360585, "solution": "Use an exchanger bypass for maximum-throughflow mode, or develop a low-loss wall exchanger and measure its K/UA together. Place useful component cooling on its own loop; do not assume installing a cold core always increases total air delivery." }, { "speed_kmh": 200, "unobstructed_bypass_mass_flow_kgs": 8.661332282836597, "warm_HX_mass_flow_kgs": 8.076846326979274, "cold_HX_mass_flow_kgs": 8.17137571221853, "cold_installed_HX_change_from_bare_bypass": -0.056568268554823886, "solution": "Use an exchanger bypass for maximum-throughflow mode, or develop a low-loss wall exchanger and measure its K/UA together. Place useful component cooling on its own loop; do not assume installing a cold core always increases total air delivery." }, { "speed_kmh": 300, "unobstructed_bypass_mass_flow_kgs": 13.019374350248732, "warm_HX_mass_flow_kgs": 12.151195801280192, "cold_HX_mass_flow_kgs": 12.259886654296851, "cold_installed_HX_change_from_bare_bypass": -0.05833519150153099, "solution": "Use an exchanger bypass for maximum-throughflow mode, or develop a low-loss wall exchanger and measure its K/UA together. Place useful component cooling on its own loop; do not assume installing a cold core always increases total air delivery." }, { "speed_kmh": 400, "unobstructed_bypass_mass_flow_kgs": 17.409052968888407, "warm_HX_mass_flow_kgs": 16.268180603620365, "cold_HX_mass_flow_kgs": 16.39247245591292, "cold_installed_HX_change_from_bare_bypass": -0.05839378596826672, "solution": "Use an exchanger bypass for maximum-throughflow mode, or develop a low-loss wall exchanger and measure its K/UA together. Place useful component cooling on its own loop; do not assume installing a cold core always increases total air delivery." } ], "phase_change_pulse_buffer": { "freeze_pressure_Pa": 20000000.0, "precharge_time_s_target": 120.0, "hydraulic_to_accumulator_efficiency_assumed": 0.85, "water_cycle_work_J_needed": 361.27697784790615, "water_mass_kg_needed": 0.19270183893025153, "cold_heat_J": 64690.372311531675, "mean_cold_heat_W_over_120s": 539.0864359294306, "mean_melt_heat_W_over_120s": 542.0970774114967, "delivered_accumulator_work_J": 307.0854311707202, "reference_gas_precharge_volume_m3": 8.70231353944846e-05, "gas_polytropic_exponent_assumed": 1.4, "gas_precharge_pressure_Pa": 8000000.0, "gas_working_pressure_range_Pa": [ 12000000.0, 20000000.0 ], "solution": "Slow phase-change conversion charges a separate rated accumulator; the accumulator supplies the short actuator pulse. Door DC actuation and independent mechanical release remain available. Pressure containment, valves, real phase rate and losses must be qualified." }, "magnetic_docking": { "cart_mass_kg_each_assumed": 0.3, "approach_speed_ms_each_assumed": 0.1, "initial_pair_kinetic_energy_J": 0.0030000000000000005, "start_centre_separation_m": 0.12, "minimum_target_centre_separation_m": 0.02, "magnetic_work_available_before_minimum_separation_J": 0.010576484219839104, "conditional_turning_separation_m": 0.04947092447088192, "predicted_force_N_at_turn": 0.11918254295542936, "both_coil_Joule_power_W": 43.33135915243329, "solution": "Reframe the cooperative magnetic branch as a slow, aligned docking/bumper-force demonstrator. Current regulators supply/exchange field energy and dissipate Joule heat; a mechanical bumper remains the terminal load path. This does not scale into general high-speed collision protection." }, "design_actions": [ { "failure": "High-speed wheel deployment removes ordinary steering/contact", "edit": "Keep normal rolling wheels. Put suction and upward air ducts in the body, with a separately controlled skirt.", "state": "Required architecture change; prior adverse deployment cases are preserved." }, { "failure": "Rigid small road gap cannot follow every surface", "edit": "Continuous compliant outer seal with internally restricted sectors, measured pressure feedback and ordinary wheel braking during pressure loss.", "state": "Map sensitivity tested; moving-road skirt and sector-fault tests still needed." }, { "failure": "A cold core can obstruct more air than cooling adds", "edit": "Bypass the core in maximum-speed mode; match useful cold loads off the primary air path.", "state": "Matched calculations report both the small cooling gain and installed obstruction." }, { "failure": "Fast phase-change actuation demands large heat rate", "edit": "Precharge a finite hydraulic accumulator over a longer thermal cycle.", "state": "Closed-cycle energy and accumulator work screens calculated." } ], "physical_measurements": 0 }