**Nomenclature**

Figure 19 Temperature distribution along the height of the liner; αC = 3.6; mixed fuel (the

0 50 100 150 200 250 300 350

T, °С

α<sup>C</sup>

Figure 20 The dependence of axis temperature behind the combustor on excess air

**Figure 20.** The dependence of axis temperature behind the combustor on excess air coefficient; mixed fuel (the embodi‐

An experimental study of the peculiarities of atomization of liquid fuels with different physical properties has been carried out. It has been shown that the spray angle upon hydraulic spraying is mainly determined by fluid viscosity, while remoteness of the point of the film decay from the exit section of the nozzle is determined by the surface tension coefficient. The effect of the properties of the liquid on the aerosol dispersity depends on the method of fluid crushing into droplets. In the case of the hydraulic atomization method without air supply, viscosity exerts the greatest impact on the dispersity of droplets. In the case of the centrifugalpneumatic method (with the same order of magnitude of the velocity of liquid and air), the greatest impact is from the surface tension. In the pneumatic method of spraying, when the injection velocity of the fluid is lower than the velocity of air, the linear size of droplets is mainly determined by the air flow irrespective of the properties of the liquid, whereas Sauter's mean

In the case of low gas-turbine engine operating modes and high viscosity fuels like biodiesel or biokerosene, the centrifugal-pneumatic atomization method is optimal, while the pneumatic

For conducting of hot tests in aviation combustor, 11 embodiments of mixed liquid fuels were proved. The mixture in a proportion of 40% of aviation kerosene, 20% of castor oil, 40% of ethanol had been chosen for the tests as the most uniform and well mixed, without deposition

Fire tests of the compartment of aviation combustion chamber with fossil fuel (kerosene TS-1) have shown comprehensible characteristics. In particular, wide side-altars of the stable combustion, assured firing of the combustion chamber, with uniform enough field of gas

2 3 4 5 6 7

coefficient; mixed fuel (the embodiment 3 from Table 2)

embodiment 3 from Table 2); QC = 0.29 m<sup>3</sup>/s

1

344 Biofuels - Status and Perspective

Т, °С

diameter depends also on the surface tension coefficient.

method is optimal for high operating modes.

ment 3 from Table 2)

**5. Summary**

and stratification.

temperature on exit.

H, mm

