A converging-diverging nozzle with a rectangular cross-section and exit area ratio AAee⁄AAtt = 4.0 operates in an under-expanded
condition. The working gas is air, the back pressure away from the nozzle exit is ppaa = 10 kPa, and the stagnation pressure is pp0 = 500 kPa. The exit pressure is greater than the back pressure (ppee > ppaa), so expansion waves form outside the exit. For the given conditions, what is the Mach number on the downstream side of the first set of expansion waves, and what is the turning angle?
1 answer:
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Answer:21.3%
Explanation:
Given
80 % reduction in tool life
According to Taylor's tool life
=c
where V is cutting velocity
T=tool life of tool
80 % tool life reduction i.e. New tool Life is 0.2T
Thus
=1.213V
Thus a change of 21.3 %(increment) is required to reduce tool life by 80%