A Determination Method of Performance Index of Pressure Atomization Nozzle

Abstract

The invention belongs to the technical field of aero-engine fuel nozzle design and especially relates to a method for determining the performance indexes of a pressure atomizing nozzle. The method includes the steps of a, determining an auxiliary spray cone angle, to be more specific, selecting a plurality of nozzles of different angles in a range of 50-80 degrees, and performing a flameout experiment under a ground idle state to select an optimal value; b, determining a main spray cone angle, to be more specific, calculating the main spray cone angle according to the size and position of a recirculation zone in a flame cylinder; c, determining auxiliary nozzle flow; d, determining main nozzle flow according to the principle that Fn / delta P of an engine in the maximum state is smaller than 2.5 and the Fn / delta P of the engine in a cruising state is smaller than 13; e, determining nozzle atomizing quality; f, determining flow distribution nonuniformity, which is smaller than 1.5-2.0%, of a master fuel pipe. The method has the advantages that the performance indexes are determined step by step by reasonable experiments and calculating methods, repetition and loss during research and development are reduced, and research and development cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of aero-engine fuel nozzle design, in particular to a method for determining the performance index of a pressure atomization nozzle. Background technique [0002] The performance index of the pressure atomizing nozzle refers to the auxiliary spray cone angle, the main spray cone angle, the flow rate of the auxiliary nozzle, the flow rate of the main nozzle, and the spray quality standard. These indicators have a direct impact on the comprehensive performance of the combustion chamber, including ignition performance, flameout performance, combustion efficiency, outlet temperature field, carbon deposition, smoke and exhaust pollution. Therefore, in the design stage of the combustion chamber, the determination of the performance index of the fuel nozzle is an important link that cannot be ignored. If the index is not selected properly, it will not only affect the combustion performance, but also affect the deve...

AI Technical Summary

Problems solved by technology

[0003] In the past, in the design of combustion chambers and fuel nozzles, there was no clear method for determining nozzle performance indicators, and there was obvious arbitrariness and blindness. As a result, in the process of combustor research and development, there were often unreasonable determinations of nozzle indicators. In some cases where the combustion performance is poor, the entire research and development process will experience large repetitions and great losses

Images