question_answer

Given that a = nozzle angle, n = number of rows of moving blades in a velocity compounded. Impulse turbine, the optimum blade speed ratio is:

A) \[2\cos {{\alpha }_{1}}n\]                     

B) \[\frac{n\cos {{\alpha }_{1}}}{2}\]

C) \[\frac{\cos {{\alpha }_{1}}}{2(n+1)}\]              

D) \[\frac{\cos {{\alpha }_{1}}}{2n}\]