A Study of Performance Output of a Multivane Air Engine Applying Optimal Injection and Vane Angles

Table 1

Input parameters.

Symbols	Parameters
Rotor to casing (d/D) ratio	0.95, 0.9, 0.85, 0.80, 0.75, 0.70, 0.65, 0.60, and 0.55, when casing diameters are kept 𝐷=𝟏𝟎𝟎 mm
𝑝1	2 bar (≈30 psi), 3 bar (≈45 psi), 4 bar (≈60 psi), 5 bar (≈75 psi), 6 bar (≈90 psi)—inlet pressures
𝑝4	(𝑣1/𝑣4)^𝛾⋅𝑝1<𝑝5 assuming adiabatic expansion
𝑝5	(𝑝4/1.1) = 1.0132 bar—exit pressure
𝑁	2500 rpm
𝐿	45 mm length of rotor (assumed minimum)
𝑛	(360/θ) number of vanes in rotor
𝛾	1.4 for air
𝜃	45° angle between 2 vanes (i.e., rotor contains correspondingly 8 number of vanes)
𝜙	60°, injection angle at which air enters into turbine.