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Design method for low-consistency blade diffuser

A design method and diffuser technology, applied in the direction of instruments, calculations, mechanical equipment, etc., can solve problems such as compressor performance, safety impact, low operating efficiency, and narrow curve range, so as to evaluate the pros and cons of the scheme and shorten the design time , The effect of fast 3D simulation

Active Publication Date: 2016-10-05
SHENYANG TURBO MASCH CORP
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Problems solved by technology

[0003] Conventional diffuser vanes can convert most of the kinetic energy of the impeller into pressure energy, but compared with vaneless diffusers, the curve range is narrower
In some harsh operating conditions, the conventional vane diffuser may not meet this condition, and even the compressor runs near the surge point for a long time, which has a great impact on the performance and safety of the compressor
Although the vaneless diffuser has a wide operating range and can meet more operating conditions, it has low operating efficiency and increased energy consumption.

Method used

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  • Design method for low-consistency blade diffuser
  • Design method for low-consistency blade diffuser
  • Design method for low-consistency blade diffuser

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] For designers, the conventional vane diffuser is relative to the vaneless diffuser, that is, a certain number of vanes are evenly distributed along the circumference of the vaneless diffuser wall, so that the airflow flows according to the shape of the vane, The flow condition is better and the flow loss is small. However, in the case of small flow, the vane diffuser is prone to spin out, causing surge. The introduction of low-consistency diffusers is precisely to reduce the sensitivity of conventional vane diffusers to small flow conditions.

[0032] Such as figure 2 Shown is a schematic diagram of the dimensioning of the diffuser, where D 3 is the inlet diameter of conventional vane diffuser, b 3 is the inlet width of conventional vane diffuser, β 3A For conventional vane diffuser inlet installation angle, D 4 is the outlet dia...

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Abstract

The invention relates to a design method for a low-consistency blade diffuser. The design method comprises the following specific steps that the chord length and an equivalent expansion angle of a common blade diffuser are calculated, an outlet installation angle and the chord length of a to-be-calculated diffuser meet the convergence criterion and are calculated through an iteration method, accordingly, a plurality of blade shape models of different consistencies are obtained, and simulating calculation is conducted through three-dimensional CFD software to determine the scheme. By means of the design method, the design period of design personnel can be greatly shortened, and the design efficiency of a centrifugal compressor is improved.

Description

technical field [0001] The invention relates to the field of optimal design of centrifugal compressors, in particular to the design method of low-consistency vane diffusers, that is, the selection and calculation of parameters of low-consistency diffusers, the determination of variables and invariants, and the reduction of design difficulty , which is convenient for designers to carry out product design and optimization. Background technique [0002] In a centrifugal compressor, the function of the diffuser is to convert the kinetic energy of the airflow at the outlet of the impeller into pressure energy. Some data show that the kinetic energy at the outlet of the centrifugal compressor accounts for 30-40% of the total input work under typical conditions. Therefore, this energy must be efficiently recovered and the diffuser is the main part of this function. [0003] Conventional diffuser blades can convert most of the kinetic energy of the impeller into pressure energy, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44G06F17/50G06F19/00
Inventor 李振华马健峰王宇李云王开宇
Owner SHENYANG TURBO MASCH CORP
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