Question

why do we need high compression in gas turbine

Answer 1

HELLO FRIEND HERE IS YOUR ANSWER.
Air is compressed in gas turbine engines such that the pressurized air will have more energy to cause more expansion in the turbine. Mainly, because the ratio between air and fuel has to be correct.
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Answer 2

☆$\red {HELLO\:DEAR}$☆

1. The compressor section of the gas turbine engine has many functions.
2. Its primary function is to supply air in sufficient quantity to satisfy the requirements of the combustion burners.

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