Symbols
$D_{am}$	diameter of constant-area mixing chamber, mm
$D_d$	diffuser outlet diameter, mm
$D_n$	primary nozzle outlet diameter, mm
$D_p$	primary nozzle inlet diameter, mm
$D_s$	suction chamber diameter, mm
$L_{am}$	constant-area mixing chamber length, mm
$L_d$	diffuser length, mm
$L_p$	primary nozzle length, mm
$L_{pm}$	constant-pressure mixing chamber length, mm
k	turbulent kinetic energy, m2·s−2
$\dot{M}$	mass flow rate, g·s−1
N	the number of variable points
P	pressure, kPa
T	temperature, K or °C
R	radius, mm
G	distance between inner radius of secondary inlet and radius of primary inlet, mm
t	time, s
u	velocity, m·s−1
U I	uncertainty for temperature, pressure and flow rate
P (I)	uncertainty due to accuracy
I	measured temperature, pressure and flow rate
Greek letters
${\mathsf{\alpha }}_{\mathrm{e}\mathrm{f}\mathrm{f}}$	effective thermal conductivity, W·m−1·k−1
${\mathsf{\delta }}_{\mathrm{i}\mathrm{j}}$	Kronecker delta function
${\mathsf{\mu }}_{\mathrm{e}\mathrm{f}\mathrm{f}}$	effective dynamic viscosity, N·s·m−2
$\mathsf{\rho }$	density, kg·m−3
$\mathsf{\epsilon }$	turbulent kinetic energy dissipation rate, m2·s−3
$\mathsf{\tau }$	stress tensor, Pa
θ	angle, °
Abbreviations
AR	area ratio
EEV	electronic expansion valve
ER	entrainment ratio
NXP	nozzle exit position
HN	the number of inlet holes
Subscripts
p	primary flow
s	secondary flow