test_injector_face_pressure Namespace Reference

Functions
	_rayleigh (g, cr)
	test_face_pressure_ratio (cr, hand)
	test_no_chamber_no_loss ()

Variables
float	G = 1.1375

Detailed Description

The injector backs onto the face pressure, not the nozzle-inlet stagnation pressure.

Heat addition in a constant-area chamber costs stagnation pressure (Rayleigh): the gas is at
rest at the face and at M_c at the nozzle inlet, M_c the subsonic root of A_c/A_t, so

    p_face / p0_ns = (1 + gamma M_c^2) / (1 + (gamma-1)/2 M_c^2)^(gamma/(gamma-1)).

Sutton & Biblarz ch. 3 tabulate ~1.05 at A_c/A_t = 2. The reference here is an independent
scipy area-Mach root and the finding's hand numbers at gamma 1.1375.

Function Documentation

_rayleigh()

test_injector_face_pressure._rayleigh ( g, cr )

protected

Definition at line 21 of file test_injector_face_pressure.py.

Referenced by test_face_pressure_ratio().

test_face_pressure_ratio()

test_injector_face_pressure.test_face_pressure_ratio	(		cr,
			hand )

Definition at line 28 of file test_injector_face_pressure.py.

References _rayleigh().

test_no_chamber_no_loss()

test_injector_face_pressure.test_no_chamber_no_loss

(

)

Definition at line 35 of file test_injector_face_pressure.py.

Variable Documentation

G

float test_injector_face_pressure.G = 1.1375

Definition at line 18 of file test_injector_face_pressure.py.