Altitude Testing of a Single ASM System Steve
- Slides: 15
Altitude Testing of a Single ASM System Steve Summer Project Engineer Federal Aviation Administration Fire Safety Branch, AAR-422 IASFPWG – Atlantic City, NJ International Aircraft Systems Fire Protection Working Group Atlantic City, NJ October 30 - 31, 2002 10 -30 -02
Objectives Ø Obtain static data of a single ASM system’s output operating in both a HF/LP and LF/HP mode. Ø Obtain dynamic data of a single ASM system’s output throughout a given flight profile operating in a LF/HP mode during ascent and cruise and a HF/LP mode during descent. Ø Compare data with predictive model output. IASFPWG – Atlantic City, NJ 10 -30 -02
Controlled Parameters Ø Inlet pressure • Controlled via a manual pressure regulator Ø Inlet air temperature and purity • Controlled to 180 ± 10 ºF via M 750 and secondary air circulation heater Ø Ambient pressure • Controlled via environmental chamber and manual dive port Ø Orifice Sizes • Controlled via needle valves, set to desired sea level NEA concentrations IASFPWG – Atlantic City, NJ 10 -30 -02
Measured Parameters Ø NEA output flow • Measured by an insertion mass flow meter Ø NEA output purity • Measured by O 2 analyzer Ø Pressure drop across the membrane • Measured by DP meter Ø Pressure drop across the orifice • Calculated as DPor = Pin - DPmem - Pamb IASFPWG – Atlantic City, NJ 10 -30 -02
Test Plan Ø Size the LF/HP orifice to give an output of 5% O 2 at SL conditions. Ø Size the HF/LP orifice to give an output of 11% O 2 at SL conditions. Ø Conduct tests operating under both flow conditions at incremental altitudes up to 42 kft. Ø Simulate a representative flight profile, controlling ambient and ASM inlet pressure. IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
Static Data Results IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
Flight Simulation Results IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
IASFPWG – Atlantic City, NJ 10 -30 -02
Conclusions Ø The system performed favorably at static points and throughout a given flight simulation. Ø High flow conditions produced NEA flow and purity data consistent with predictive model output. Ø Some corrections need to be made to the predictive model under low flow conditions. IASFPWG – Atlantic City, NJ 10 -30 -02