Dear all,

I am not getting the right key to get clear in my basic doubt regarding gas turbine. Based on my understanding, the air has lesser density at elevated atmospheric temperatures/ humidity compared to normal condition (Water vapor molecular weight is lesser than air). Since the compressor suction duct volume is constant, lesser the density of air will lead to suck less weight of air when the ambient switches to high temperature /humidity. The compressing air weight will fix the amount of fuel it can burn eventually the amount of power it can produce.

My doubt is in all the gas turbines, the power is getting increased by spraying water (making air with 100% relative humidity), at the inlet of compressor. How is it happening?

Kindly correct me if I am wrong else clarify.
Thanks in advance.

 

Perhaps if you knew what we used to call the inlet water sprays it would help you to understand: Evaporative coolers.

The spraywater evaporates and cools the inlet air temperature (due to the latent heat of vaporization).