Gaganyaan mission: ISRO successfully test the LEM System

ISRO successfully test the LEM System that will ensure the safety of astronauts, in Sriharikota on August 10, 2022.

The newly developed launch vehicle SSLV faced a series of bad events, but ISRO did not give up; instead, it moved on to achieve greater feats.

On 10 August 2022, another important milestone in the Gaganyaan project is completed thanks to the Indian Space Agency.

At the Satish Dhawan Center in Sriharikota, ISRO successfully completed a test fire of the Low Altitude Escape Motor (LEM) of the Crew Escape System (CES).

In case of any eventuality, the Crew Escape System (CES) takes away the Crew module of the Gaganyaan mission and rescues the astronauts.

What is LEM  (Low Altitude Escape Motor)?

In case of mission-abort during takeoff, LEM gives the necessary thrust to CES to remove the Crew Module from the launch vehicle.

In other words, LEM can be thought of as a component that would enable CES to separate from the crew module in any case of any incident where astronauts need to be reduced.

ISRO said, "LEM is a distinctive special purpose solid rocket motor with 4 reverse flow nozzles and generates maximum sea level thrust of 842 kN (nominal) with a burn time of 5.98 s (nominal)."

In an official release, the Space Agency explained - "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 reverse flow multiple nozzles in this solid rocket motor. The reverse flow nozzle implies the reversal of the exhaust gas flow direction in the nozzle region."

Main Objectives of the Gaganyaan LEM Static Test ---

1. Evaluation of motor ballistic parameters 2. Validation of motor subsystem performance and confirmation of the design margins.

3. Evaluation of the thermal performance of nozzle liners; especially to confirm the erosion / ablative characteristics. 4. Validation of the integrity of all interfaces.

5. Evaluation of the head-end mounted safe arm (HMSA) based ignition system performance.

6. Evaluation of side thrust due to misalignment and variation in flow and other functional parameters including flow reversal.

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