ISRO successfully conducts Gaganyaan’s LEM static test of Crew Escape System

Insight Online News

Chennai, Aug 11 : The Indian Space Agency has achieved yet another milestone, when it successfully conducted Low Altitude Escape Motor (LEM)

Static Test of Crew Escape System for its first manned Gaganyaan mission.

ISRO sources today said another important milestone in the Gaganyaan

project is completed, by successfully test-firing the LEM of Crew Escape

System (CES), from Sriharikota yesterday.

The CES takes away the Crew module of Gaganyaan mission in case of

any eventuality and rescues the astronauts.

In case of mission-abort during the initial phase of flight, LEM provides the

required thrust to CES, to take away Crew Module from the launch vehicle.

LEM is a distinctive special purpose solid rocket motor with four reverse

flow nozzles and generates maximum sea level thrust of 842 kN (nominal)

with burn time of 5.98 s (nominal).

“The nozzle end of LEM is mounted at the fore end of the launch vehicle

unlike at aft end in conventional rocket motors to avoid exhaust plume

impingement on crew module. This necessitates the use of a reverse

flow multiple nozzle in this solid rocket motor. The reverse flow nozzle

implies the reversal of the exhaust gas flow direction in the nozzle

region”, ISRO said.

The main objectives of the static test were to evaluate motor ballistic

parameters, validate motor subsystem performance and to confirm

the design margins, evaluate the thermal performance of nozzle liners

especially to confirm the erosion/ablative characteristics, validate

integrity of all interfaces, besides evaluation of the head-end mounted

safe arm (HMSA) based ignition system performance and the side

thrust due to misalignment and variation in flow and other functional

parameters including flow reversal.

UNIINDIA

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