Exhaust volute with noise reduction function
By introducing a diffuser section, a volute shell, a converging and collecting section, and a non-uniform sawtooth design into the gas turbine exhaust volute, noise reduction is achieved while maintaining flow efficiency, thus solving the problem of noise pollution from the gas turbine exhaust volute.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AECC SHENYANG ENGINE RES INST
- Filing Date
- 2026-03-16
- Publication Date
- 2026-05-29
Smart Images
Figure CN122106701A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of gas turbine design, and specifically relates to an exhaust volute with noise reduction function. Background Technology
[0002] The exhaust volute is a key component of a gas turbine power plant, and its exhaust noise is a major noise source for shipboard gas turbines, posing a health hazard to shipboard personnel. Therefore, noise suppression measures are necessary. The high-speed rotating airflow generated at the turbine outlet enters the exhaust volute, further increasing airflow instability and creating a non-uniformly distributed airflow outlet, resulting in a high-intensity noise source. For the rectangular outlet of the exhaust volute, a non-uniformly distributed serrated structure is adopted to guide the airflow into the shear layer, enhancing mixing and reducing the intensity of exhaust noise radiation.
[0003] Exhaust noise reduction design typically involves shaping the trailing edge of the circular exhaust outlet to reduce noise. This affects the outlet area of the exhaust system, resulting in flow losses while achieving noise reduction. Currently, no noise reduction measures are implemented at the rectangular exhaust volute outlets of existing gas turbines, both domestically and internationally.
[0004] Therefore, how to effectively reduce noise in the exhaust volute is a problem that needs to be solved. Summary of the Invention
[0005] To address the aforementioned issues, this application provides an exhaust volute with noise reduction functionality, thereby resolving the problem that existing exhaust volutes are difficult to effectively reduce noise.
[0006] The technical solution of this application is: an exhaust volute with noise reduction function, including a diffuser section, a volute shell, a converging and collecting section, a serrated convex surface and a serrated concave surface;
[0007] One side of the volute shell is connected to the converging gas collecting section, and the volute shell and the converging gas collecting section form a gas collecting chamber; the input end of the diffuser section receives high-temperature gas; the output end is connected to the inside of the gas collecting chamber.
[0008] The gas collecting chamber has an original volute outlet section on one side, and the serrated convex surface and serrated concave surface are located at the opening of the original volute outlet section.
[0009] The volute housing has a cone coaxially arranged with the diffuser section in the middle, and the cone and the diffuser section form an annular channel that deflects from the middle to the outside.
[0010] Preferably, both the serrated convex surface and the serrated concave surface are designed with non-uniform distribution, and the areas of the serrated convex surface and the serrated concave surface are equal.
[0011] Preferably, the tooth length of the serrated convex surface and the serrated concave surface gradually increases from both sides to the middle.
[0012] Preferably, the converging gas collection section has a rectangular cone structure.
[0013] Preferably, the cross-section of the annular channel is an arc structure.
[0014] Preferably, the diffuser section is located at one end within the housing, in the middle of the gas collecting chamber.
[0015] The exhaust volute housing with noise reduction function of this application has the following advantages:
[0016] By coordinating the structures of the diffuser section, the volute casing, and the converging gas collection section, the high-temperature gas is first diffused and decelerated, and the turbulent airflow is rectified, making the outlet velocity field more uniform. Then, combined with the design of the circumferential non-uniformly distributed sawtooth configuration at the volute outlet, the ambient atmospheric eddies are effectively guided into the shear layer of the gas flow, which greatly increases the mixing degree between the jet and the atmospheric environment, reduces the jet velocity, suppresses the development of large-scale turbulent vortices, reduces the jet trajectory length, and thus significantly reduces the jet noise radiation intensity and exhaust turbulence mixing noise.
[0017] The non-uniformly distributed sawtooth design strictly ensures that the original volute outlet cross-sectional area remains unchanged, structurally avoiding the generation of flow losses. While maximizing the noise reduction benefits of the exhaust volute, it also ensures the original operating efficiency of the gas turbine power unit. This fills the technical gap in the rectangular outlet noise reduction design of gas turbine exhaust volutes both domestically and internationally, and effectively solves the problem of the exhaust volute of ship gas turbines being a major noise source that harms the health of personnel. Attached Figure Description
[0018] Figure 1 This is a cross-sectional view of the overall configuration of this application;
[0019] Figure 2 This is a diagram showing the flow direction of the high-temperature gas in this application;
[0020] Figure 3 This is the isometric drawing of the overall structure of this application.
[0021] 1. Diffuser section; 2. Volute casing; 3. Converging and collecting section; 4. Original volute outlet section; 5. Serrated convex surface; 6. Serrated concave surface; 7. Cone. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0023] The first aspect of this application provides an exhaust volute with noise reduction function, such as... Figures 1-3 It includes a diffuser section 1, a volute shell 2, a convergence and gas collection section 3, a serrated convex surface 5, and a serrated concave surface 6.
[0024] One side of the volute housing 2 is connected to the converging gas collecting section 3, and the volute housing 2 and the converging gas collecting section 3 form a gas collecting chamber; the input end of the diffuser section 1 receives high-temperature gas; and the output end is connected to the inside of the gas collecting chamber.
[0025] The original volute outlet section 4 is provided on one side of the gas collecting chamber, and the serrated convex surface 5 and the serrated concave surface 6 are provided at the opening of the original volute outlet section 4.
[0026] The middle part of the volute housing 2 is provided with a cone 7 that is coaxially arranged with the diffuser section 1, and an annular channel that deflects from the middle to the outside is formed between the cone 7 and the diffuser section 1.
[0027] High-temperature gas A is diffused and deflected in the annular channel between cone 7 and diffuser section 1, which greatly reduces the airflow velocity entering the shell. After flowing out of diffuser section 1, it flows in a complex manner in the shell, with both axial and radial turns, and finally flows out from the original volute outlet section 4 of converging gas collection section 3. At the same time, the serrated convex surface 5 and serrated concave surface 6 rectify the high-temperature gas exiting the original volute outlet, so that the ambient atmospheric eddies enter the shear layer of high-temperature gas A and form vortices.
[0028] Through the above design, the diffusion, deflection and deceleration of high-temperature gas and the rectification of turbulent airflow can be achieved, making the outlet velocity field more uniform. At the same time, the cooperation of the sawtooth convex surface 5 and the sawtooth concave surface 6 provides a structural basis for noise reduction. The annular channel formed by the cone 7 and the diffuser section 1 can guide the airflow to deflect from the middle to the outside, adapting to the airflow requirements of the volute shell 2, reducing the flow turbulence of the airflow in the shell, further reducing the instability of the airflow, and optimizing the flow path of the gas from a structural perspective, laying a good airflow foundation for subsequent noise reduction.
[0029] Preferably, both the serrated convex surface 5 and the serrated concave surface 6 are designed with non-uniform distribution, and the areas of the serrated convex surface 5 and the serrated concave surface 6 are equal.
[0030] The non-uniformly distributed serrated convex surface 5 and serrated concave surface 6 can effectively guide the ambient atmospheric eddies into the shear layer of the gas flow, improve the mixing degree between the jet and the atmospheric environment, and the equal area of the two can ensure that the area of the original volute outlet section 4 remains unchanged, avoiding flow loss due to changes in cross-sectional area, thus achieving noise reduction while ensuring the operating efficiency of the gas turbine power unit.
[0031] Preferably, the tooth length of the serrated convex surface 5 and the serrated concave surface 6 gradually increases from both sides to the middle.
[0032] The design of the sawtooth tooth length gradually increasing from both sides to the middle is adapted to the airflow distribution characteristics of the exhaust core area of the convergent gas collection section 3. It forms a stronger mixing effect in the exhaust core area, more effectively suppresses the development of large-scale turbulent vortices, reduces the jet trajectory length, maximizes the reduction of exhaust turbulent mixing noise, and improves the overall noise reduction benefits.
[0033] Preferably, the converging gas collection section 3 has a rectangular cone structure 7.
[0034] The converging gas collection section 3 adopts a rectangular cone structure 7, which is adapted to the structural characteristics of the rectangular outlet of the exhaust volute. It can more efficiently rectify the turbulent gas discharged from the volute shell 2, improve the uniformity of the outlet velocity field, and form a good structural fit with the non-uniformly distributed sawtooth structure to ensure the flow state when the gas is discharged, thus helping to achieve the noise reduction effect.
[0035] Preferably, the cross-section of the annular channel is an arc structure.
[0036] The annular channel has a circular arc cross-section, which reduces the flow resistance of the airflow within the channel, avoids local turbulence and flow loss at the bend, allows the airflow to deflect more smoothly from the middle to the outside, reduces the instability of the airflow, reduces additional noise caused by airflow disturbance, and ensures the flow efficiency of the gas.
[0037] Preferably, the diffuser section 1 is located at one end inside the housing, in the middle of the gas collecting chamber.
[0038] The diffuser section 1 is located at one end inside the casing, in the middle of the gas collecting chamber. This allows high-temperature gas to enter from the middle of the gas collecting chamber, making the gas distribution in the volute casing 2 more uniform, reducing local airflow accumulation and velocity differences, reducing the degree of turbulence in the airflow within the casing, further optimizing the airflow state, reducing noise caused by uneven airflow, and improving the deceleration effect of the diffuser section 1 on the gas.
[0039] In summary, this application has the following advantages:
[0040] By coordinating the structures of the diffuser section, the volute casing, and the converging gas collection section, the high-temperature gas is first diffused and decelerated, and the turbulent airflow is rectified, making the outlet velocity field more uniform. Then, combined with the design of the circumferential non-uniformly distributed sawtooth configuration at the volute outlet, the ambient atmospheric eddies are effectively guided into the shear layer of the gas flow, which greatly increases the mixing degree between the jet and the atmospheric environment, reduces the jet velocity, suppresses the development of large-scale turbulent vortices, reduces the jet trajectory length, and thus significantly reduces the jet noise radiation intensity and exhaust turbulence mixing noise.
[0041] The non-uniformly distributed sawtooth design strictly ensures that the original volute outlet cross-sectional area remains unchanged, structurally avoiding the generation of flow losses. While maximizing the noise reduction benefits of the exhaust volute, it also ensures the original operating efficiency of the gas turbine power unit. This fills the technical gap in the rectangular outlet noise reduction design of gas turbine exhaust volutes both domestically and internationally, and effectively solves the problem of the exhaust volute of ship gas turbines being a major noise source that harms the health of personnel.
[0042] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An exhaust volute with noise reduction function, characterized in that, It includes a diffuser section (1), a volute shell (2), a convergence and gas collection section (3), a serrated convex surface (5), and a serrated concave surface (6); One side of the volute housing (2) is connected to the converging gas collecting section (3), and the volute housing (2) and the converging gas collecting section (3) form a gas collecting chamber; the input end of the diffuser section (1) receives high-temperature gas; the output end is connected to the inside of the gas collecting chamber; The gas collecting chamber has an original volute outlet section (4) on one side, and the serrated convex surface (5) and serrated concave surface (6) are located at the opening of the original volute outlet section (4). The volute housing (2) is provided with a cone (7) coaxially arranged with the diffuser section (1) in the middle, and an annular channel deflected from the middle to the outside is formed between the cone (7) and the diffuser section (1).
2. The exhaust volute with noise reduction function as described in claim 1, characterized in that, The serrated convex surface (5) and the serrated concave surface (6) are both designed with non-uniform distribution, and the areas of the serrated convex surface (5) and the serrated concave surface (6) are equal.
3. The exhaust volute with noise reduction function as described in claim 1, characterized in that, The tooth length of the serrated convex surface (5) and serrated concave surface (6) gradually increases from both sides to the middle.
4. The exhaust volute with noise reduction function as described in claim 1, characterized in that, The convergence and gas collection section (3) has a rectangular cone (7) structure.
5. The exhaust volute with noise reduction function as described in claim 1, characterized in that, The cross-section of the annular channel is an arc structure.
6. The exhaust volute with noise reduction function as described in claim 1, characterized in that, The diffuser section (1) is located at one end inside the housing, in the middle of the gas collecting chamber.