Isro’s GSLV-F10 flight in August final yr failed due to a malfunctioning valve that led to inadequate stress within the liquid hydrogen tank within the cryogenic higher stage of the launch car, discovered the national-level failure evaluation committee that submitted its report on Thursday.
The area company on the time had stated the third or cryogenic higher stage of the launch car, which was carrying on board an earth statement satellite tv for pc EOS-03, didn’t ignite resulting from a “technical anomaly,
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Dr V Narayanan, Director, ISRO’s Liquid Propulsion Systems Centre, in November stated: “The reason for the GSLV F-10 failure was a 50 millibar reduction in the LH-2 tank pressure.”
GSLV-F10 was one of many solely two missions that have been carried out by the area company final yr owing to the second wave of the pandemic.
As per the failure evaluation committee’s report, the deviation within the efficiency of the cryogenic higher stage was noticed by the on-board laptop at 297.3 seconds after the lift-off and the mission was aborted by 307 seconds.
“The floor servicing of the cryogenic stage was regular and the required lift-off situations have been achieved. However, subsequent to lift-off, the committee noticed … a decrease tank stress on the time of ignition of the engine. This resulted in inadequate circulate of liquid hydrogen into the engine thrust chamber. Detailed research point out that the almost definitely cause for the noticed discount in tank stress is a leak within the respective Vent and Relief Valve (VRV), which is used for relieving the surplus tank stress throughout flight,” Isro stated in a press release.
As per the report of the failure evaluation committee, probably the most possible cause for leakage of the VRV valve is injury to the smooth seal that would have occurred “during the valve operations or due to contamination and valve mounting stresses induced under cryogenic temperature conditions,” the ISRO assertion stated.
To enhance the robustness of the cryogenic higher stage – a model of which may also be used on GSLV Mk III that may carry our astronauts to area – the committee has instructed incorporating an energetic LH2 tank pressurisation system to make sure enough stress earlier than the engine begin command , strengthening the VRV and related fluid circuits to keep away from a risk of leakage, and automated monitoring of extra cryogenic parameters whereas giving lift-off clearance.
To arrive on the conclusions, the failure evaluation committee reviewed flight knowledge together with knowledge associated to actions starting from the stage preparation at launch advanced, countdown, and lift-off. The committee additionally really useful a sequence of laptop simulations and confirmatory floor checks to simulate situations near GSLV-F10 flight and validate the findings.
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With inputs from TheIndianEXPRESS
