Question

(d) (4 pts) Identify the limit a compressor approaches i. when the pressure ratio is raised too high at a set mass loading parameter; and ii. when mass loading parameter is raised too high at a set pressure ratio.

Answer 1

Criven: The given velocity triangle shown in figure below. C2 ß2 C2 G Wz U= 150 m/8 where subscript, 112 (inlet and outler velocity triangle) absolute velocity W relative velo velocity blade velocity а when (2 whirle velocity, The limit compressor approches- when the pressure satio is raised too high at a ser mass loading porameter pressure rano is raised too high then power required is more then the whirl component of velocity is also more than C₂ = C₂ COSA + G cosa, then set mass flow rate we will increased the flow velocity Lobsolute at inlet and hence power of the Compressor increased, When mass loading parameter is raised too high at a ser pressure sario then there is choking and then flow rate because of the aero alonomic phenamnen know as stelling blade design and porometers design point of the pressure roho and exellent performance of the compressor Occure revers C and these will be mass flow rate is