CALCULATED INSTALLED POWER PLANT PERFORMANCE
Abstract
The report presents calculated installed performance characteristics for the U. S. Army XV-5A propulsion system. The propulsion system consists of two General Electric X353-5B power-plants, one G. E. X376 pitch control fan, and associated ducting, controls and accessory equipment. Installed performance of turbojet mode is presented for ARDC Standard Day and ANA 421 Hot Day for one and two engine operation. Performance data include gross thrust, propulsion system drag, net thrust, fuel flow and cooling system drag. A sea level static thrust of 4,920 pounds is estimated for an ARDC Standard Day. For ANA 421, Hot Day conditions at 2,500 feet altitude, static thrust is 4,250 pounds. A detailed analysis of J85 engine operation at near idle condition (47% to 60% rpm) showed that exhaust gas temperature increased rapidly with increasing engine air inlet temperature and shaft power extraction. Thus, to preclude exceeding exhaust gas temperature limits, due to reingestion of hot engine exhaust gases and/or varying power extraction for system checkout, a minimum rpm of 70% for the J85 engines is recommended for XV-5A fan mode operation. The engine air inlet shows excellent performance throughout its required operating envelope. A minimum total pressure recovery of 98.4% is available for static operation and the pressure recovery exceeds 99% for high speed cruise flight at Mach 0.7. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1964
- Accession Number
- AD0647387
Entities
Organizations
- General Electric