A resistojet has a throat diameter of 0.3 mm and is to be operated with helium at a pressure of 6.89 MPa (1000 psi). The exhaust nozzle exit diameter is 3.0 mm. The specific heat may be taken as γ = 1.67. The maximum temperature is 1000 K.
a.Determine the mass flow rate, specific impulse, and thrust for isentropic expansion with no back pressure.
b.On the assumption that the cumulative heat loss q is given by dq/dT = 1.5 kJ/kg • K, estimate the specific impulse for the same nozzle pressure ratio as in case (a). Neglect frictional effects.
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