High-temperature-rise combustion chamber head for suppressing Venturi carbon deposit

Abstract

The invention relates to a high-temperature-rise combustion chamber head for suppressing Venturi carbon deposit. The high-temperature-rise combustion chamber head comprises a primary tilting-axial cyclone (30), a Venturi (31), a secondary tilting-axial cyclone (32), a bushing (33) and a splash guard (35). The lower layer of the Venturi (31) comprises an internal contracting section (39), an internal throat (40) and an internal expanding section (41); the upper layer thereof comprises an external contracting section (42), an external throat (43) and an external expanding section (44), an internal cavity (37) is formed between the lower layer and the upper layer, and the internal expanding section (41) is provided with pores or slits (45) for cooling and blowing deposited carbon away. An active measure for suppressing Venturi carbon deposit is employed, the cavity is formed inside the Venturi, and cooling pores and slits are formed in the internal expanding section, and further, an air diaphragm is formed on the inner wall of the Venturi; thus, temperature of the inner wall of the Venturi is reduced effectively and deposit carbon generated by high-temperature pyrolysis of fuel oil issuppressed actively.

Description

technical field [0001] The invention belongs to the field of aero-engines, and relates to a high-temperature rise combustion chamber head capable of suppressing carbon deposition in a venturi tube. Background technique [0002] Aviation gas turbines have been mainly used in military applications since their birth. Modern high-performance fighter jets generally use turbofan engines with small bypass ratios. 16-20), the cycle parameters of the engine are also continuously improved, the total boost ratio has reached more than 40, and the temperature of the inlet and outlet of the combustion chamber has increased from 800-1650K to 1000-2150K. At present, major aero-engine manufacturers are vigorously conducting research on military high-temperature rise combustors. [0003] Fuel atomization and oil-gas matching are the key to determine the overall performance of high-performance combustors. In order to achieve fuel atomization and oil-gas matching, modern high-performance combu...

AI Technical Summary

Problems solved by technology

In order to ensure that the Venturi tube does not deposit carbon at higher air inlet temperature and fuel temperature in the aero-engine combustor, GE Company of the United States continuously adjusts the diameter of the Venturi tube throat and the distance between the Venturi tube throat and the outlet of the primary cyclone. A series of tests were carried out on the E3 double-annular chamber combustion chamber, and the carbon deposition criteria for preventing carbon deposition in the nozzle and the venturi tube were obtained to guide the integrated design of the nozzle, swirler and venturi tube. This method of preventing carbon deposition is mainly From the perspective of aerodynamics, on the one hand, a high-speed flow is formed at the throat of the Venturi tube, which reduces the residence time of the fuel at the throat; Carbon deposition occurs on the inner wall of the Venturi tube, but it cannot fundamentally solve the problem of carbon deposition in the Venturi tube

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