Calculation method for inherent acoustic frequency of centrifugal nozzle
A centrifugal nozzle and calculation method technology, applied in the field of combustion, can solve problems such as inability to effectively guide the structural design of centrifugal nozzles, large errors, lack of centrifugal nozzles, etc., and achieve the effect of solving the natural acoustic frequency of centrifugal nozzles and reducing the error of calculation results
Pending Publication Date: 2022-04-12
BEIJING AEROSPACE PROPULSION INST
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Problems solved by technology
[0004] At present, in the design process of centrifugal nozzles, there is a lack of calculation methods for the natural acoustic frequency of centrifugal nozzles. The natural frequency calculation formula of a quarter-wavelength tube is used directly to calculate the natural frequency of centrifugal nozzles. The natural acoustic frequency of the centrifugal nozzle is 4025Hz, and the simulation results show that the natural frequency of the actual centrifugal nozzle is 3497Hz, with an error of 15.1%, which cannot effectively guide the structural design of the centrifugal nozzle
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[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0031] The sound wave in the centrifugal nozzle will be reflected and transmitted on the interface of two media with different characteristic impedances durin...
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The invention discloses a calculation method for the inherent acoustic frequency of a centrifugal nozzle. The method comprises the following steps that the components and temperature of gas in an air vortex are obtained according to the preset mass flow ratio of an oxidizing agent and fuel in an injector and the preset pressure of a combustion chamber; the thickness of the conical liquid film is obtained according to the flow of the single centrifugal nozzle, the length Lb of the conical liquid film before crushing and the half-cone angle cosine value cos alpha of the liquid film are obtained according to the thickness of the conical liquid film, and the axial length delta l of the conical liquid film before crushing is obtained according to the length Lb of the conical liquid film before crushing and the half-cone angle cosine value cos alpha of the liquid film; the gas sound velocity c is obtained according to the components and temperature of gas in the gas vortex and the preset combustion chamber pressure; and the inherent acoustic frequency of the centrifugal nozzle is obtained according to the axial length delta l of the conical liquid film before crushing, the gas sound velocity and the preset axial length of the centrifugal nozzle. The optimization design of the centrifugal nozzle can be rapidly and efficiently guided.
Description
technical field [0001] The invention belongs to the technical field of combustion, in particular to a method for calculating the natural acoustic frequency of a centrifugal nozzle. Background technique [0002] Centrifugal nozzles are widely used in aerospace, thermal engineering and other fields because of their good atomization effect. During the working process of the centrifugal nozzle, the liquid is swirled through the tangential hole or the vortex, so that the liquid swirls against the wall to form a liquid film, and a hollow gas vortex is formed in the center of the centrifugal nozzle, and the tangential velocity of the liquid film after flowing out of the nozzle is gradually transformed into a radial velocity. Speed, the thickness of the liquid film gradually decreases, and the liquid film expands to form a cone-shaped liquid film. When the amplitude of the disturbance wave is greater than the thickness of the liquid film, the liquid film breaks. The air vortex is d...
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Login to view more IPC IPC(8): G06F30/17G06F30/20G06F113/08G06F119/08G06F119/14
Inventor 乔兴伟孙纪国刘倩潘亮潘刚张亚田原许晓勇
Owner BEIJING AEROSPACE PROPULSION INST
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