Example of determination of parameters of ejecor gas generator

Given data:

As aviation GTE accepted turbo shaft engine Д-25В.

Т _н =313 K

Pa

f =1,25

Т ₃ = 400K

GTE parameters

Type of GTE	GTE parameters
Diameter of the outlet section of the nozzle d, [m]	Gas flow rate through the nozzle , [kg/s]	Gas temperature in the outlet section of the nozzle , [K]	Velocity of the gas in the outlet section of the nozzle [m/s]
TSE Д-25В	0,5

Solution:

Determine relative air consumption .

Determine total air consumption through the ejector

(kg/s).

Using a graphical representation of the relative amount of air depends on the relative area of ejector β and ejector expansion degree f (Fig. 3), we find the relative area of ejector β = 8.

Determine area of cross-section (m²).

Determine diameter of ejector D from area F₁,

, (m). This parameter we can find in another way through relative ejector area β. As known , from other side . Then , whence , (m).

Determine the diameter of the outlet section of ejector diffuser D ₄ by ejector expansion degree f, i.e. . Whence , (m).

Determine velocity of the gas flow at inlet of diffuser

, (m/s).

Determine velocity of the gas flow at outlet of diffuser

, (m/s).

Determine total pressure at outlet of diffuser

, (Pa).

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