Variable-equivalent nozzle simulating tool

Abstract

The invention belongs to the field of aero-engine fuel accessory verification testing technology, and particularly to a variable-equivalent nozzle simulating tool. The variable-equivalent nozzle simulating tool comprises a housing (2), a valve core (3), a valve sleeve (4), a spring (5), a spring guiding seat (7), a sealing end cover (8), a floating spring seat cushion (9), an adjustable cushion plate (10) and a throttle nozzle (11). The tool can automatically adjust a nozzle equivalent according to a front-and-back pressure difference and a nozzle characteristic for satisfying a testing requirement. The variable-equivalent nozzle simulating tool has advantages of satisfying a requirement for different nozzle characteristics through replacing the valve sleeve, reducing testing cost and improving response speed and control stability of an electric control nozzle.

Description

technical field [0001] The invention belongs to the technical field of verification test of aero-engine fuel accessories, and relates to a variable-equivalent nozzle simulation tool. Background technique [0002] With the development of the aviation industry, the requirements for low fuel consumption and low pollution of aircraft are increasing. In order to meet the requirements of low fuel consumption and low pollution of aircraft, the combustion chamber of modern civil aviation engines usually adopts multi-ring cavity and multi-stage combustion to improve combustion efficiency and reduce pollution. The fuel nozzles have also changed from equivalent nozzles to variable equivalent nozzles. Compared with the equivalent nozzle, the variable equivalent nozzle changes with the change of the pressure difference between the front and rear of the nozzle. In the past, the orifice was used instead of the equivalent nozzle in the system or component level test bench, and the equivale...

AI Technical Summary

Problems solved by technology

In the past, the orifice was used instead of the equivalent nozzle in the system or component level test bench, and the equivalent of the flat nozzle could not be adjusted according to the pressure difference between the front and rear of the nozzle, which could not meet the needs of the variable equivalent nozzle.

The test cost of using real nozzles is high and it is not suitable for component-level test benches. The response speed and control stability of electronically controlled nozzles are poor. Simulating variable equivalent nozzles in dynamic tests is easy to cause overshoot, and the relative cost is relatively high.

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