Loading...
Please wait, while we are loading the content...
Similar Documents
The 7.5k lbf thrust engine preliminary design for orbit transfer vehicle
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hayden, Warren R. Sabiers, Ralph Schneider, Judy |
| Copyright Year | 1994 |
| Description | This document summarizes the preliminary design of the Aerojet version of the Orbit Transfer Vehicle main engine. The concept of a 7500 lbf thrust LO2/GH2 engine using the dual expander cycle for optimum efficiency is validated through power balance and thermal calculations. The engine is capable of 10:1 throttling from a nominal 2000 psia to a 200 psia chamber pressure. Reservations are detailed on the feasibility of a tank head start, but the design incorporates low speed turbopumps to mitigate the problem. The mechanically separate high speed turbopumps use hydrostatic bearings to meet engine life requirements, and operate at sub-critical speed for better throttling ability. All components were successfully packaged in the restricted envelope set by the clearances for the extendible/retractable nozzle. Gimbal design uses an innovative primary and engine out gimbal system to meet the +/- 20 deg gimbal requirement. The hydrogen regenerator and LOX/GH2 heat exchanger uses the Aerojet platelet structures approach for a highly compact component design. The extendible/retractable nozzle assembly uses an electric motor driven jack-screw design and a one segment carbon-carbon or silicide coated columbium nozzle with an area ratio, when extended, of 1430:1. A reliability analysis and risk assessment concludes the report. |
| File Size | 161712325 |
| Page Count | 365 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940027112 |
| Archival Resource Key | ark:/13960/t7dr7s837 |
| Language | English |
| Publisher Date | 1994-01-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Throttling Rocket Nozzles Orbit Transfer Vehicles Turbine Pumps Gimbals Reliability Analysis Risk Regenerators Hydrogen Oxygen Engines Heat Exchangers Rocket Engine Design Spacecraft Propulsion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
