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Axial swirler

A swirler, axial technology, applied in the direction of burners, combustion methods, combustion chambers, etc., can solve the problems of energy loss, unfavorable wake and recirculation area, high pressure drop, etc., to achieve improved flashback resistance, pressure Drop reduction design, reduce the effect of pressure drop

Active Publication Date: 2014-05-21
ANSALDO ENERGIA SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the swirl number, the higher the pressure drop, resulting in an unfavorable loss of energy
[0005] Conventional axial swirlers that inject fuel upstream typically create unfavorable wakes and recirculation zones at the fuel injection location

Method used

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Examples

Experimental program
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Embodiment Construction

[0117] figure 1 A schematic perspective view of a conventional cyclone 43 is shown. The swirler 43 comprises an annular housing with an inner limiting wall 44', an outer limiting wall 44", an inlet region 45 and an outlet region 46. The guide vanes 3 are arranged between the inner limiting wall 44' and the outer limiting wall 44". The swirl vanes 3 are provided with an outflow angle which is independent of the distance R from the swirl axis 47 but remains constant over the entire annulus. The leading edge region of each vane 3 has a profile oriented parallel to the inlet flow direction 48 . In the example shown, the incoming flow is coaxial with the longitudinal axis 47 of the swirler 43 . The profile of the vane 3 is turned relative to the main flow direction 48 to impart a swirl on the flow and to create an outlet flow direction 55 which is angled relative to the inlet flow direction 48 . The main flow is coaxial with the annular cyclone. The outlet flow rotates about t...

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PUM

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Abstract

The present invention relates to an axial swirler, in particular for premixing of oxidizer and fuel in gas turbines. The swirler comprises comprises a series of swirl vanes with a streamline cross-section, wherein each swirl vane has a leading edge, a trailing edge, and a suction side and a pressure side extending each between said leading and trailing edges. The swirl vanes are arranged around a swirler axis, wherein said leading edges extend essentially in radial direction. Flow slots are formed between the suction side of each swirl vane and the pressure side of its nearest neighboring swirl vane. Furthermore, at least one swirl vane has a discharge flow angle between a tangent to its camber line at its trailing edge and the swirler axis that is monotonically increasing with increasing radial distance from the swirler axis. The invention also relates to a burner with such a swirler and a method of operating said burner.

Description

technical field [0001] The invention relates to an axial swirler according to the preamble of claim 1, in particular for premixing purposes in gas turbines, and the invention further relates to an axial swirler for a combustion chamber having such an axial swirler of the burner. In particular, the invention relates to axial swirlers for introducing at least one gas and / or liquid into a burner. Furthermore, the invention relates to a method of operating such a burner. Background technique [0002] Cyclones are used as mixing devices in various technical applications. The cyclone is optimized to reduce the energy required to obtain a mixture of a specified degree of homogeneity. In continuous flow mixing, the pressure drop across the mixing device is a measure of the energy required. Additionally, the time and space required to achieve a specified degree of homogeneity are important parameters for evaluating mixing devices or mixing elements. Cyclones are typically used t...

Claims

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Application Information

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IPC IPC(8): F23R3/38
CPCF23R3/14F23C7/004F23D2900/14021F23R3/286F23R3/36
Inventor F.比亚吉奧里M.N.波亚帕卡姆R.森尼K.斯耶德
Owner ANSALDO ENERGIA SWITZERLAND AG