การออกแบบใบพัดเครื่องจักรเทอร์โบแบบย้อนกลับ 3 มิติ

A 3-D Inverse Design Method Applicable to Turbomachinery

Name: ทนงศักดิ์ อำพนเกียรติ

Name: Thanongsak Amphonkiat

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี. คณะวิศวกรรมศาสตร์. สาขาวิชาวิศวกรรมเครื่องกล

keyword: ใบพัด

; เครื่องจักรเทอร์โบ

Abstract: This thesis presents a method of how to design an inverse turbomachinery blade forthe two and three-dimensional flow. The proposed assumptions are that the working fluid isinviscid and incompressible, as well as the thickness of the blade is very thin when compared toits other dimensions so that it is negligible. Firstly, the analysis of the fluid's velocity isconducted with taking into account the presence of the blade. The velocity divided is into twoparts; circumferential velocity and periodic velocity. Then, the blade's surface can bedetermined by employing the velocity vectors tangential to its surface. This blade's shape isshowed in the two-dimensional elliptic-type partial differential equation. The finite differencemethod is utilized to solve the equation. However, due to the complexity of the blade's shape,the non-uniform physical grids are generated. Therefore, the "Body-Fitted" transformation isperformed to achieve the grid unifonnity.The calculation results showed that in the case of constant blade's radius equipped withstationary or rotating ling the two-dimensional model doesn't provide satisfying result. Thethree-dimensional model, consequently, is needed for the design improvement. Furthermore, ithas been found that the solutions' rate of convergence depends on number of theblades in thefan and the hub to tip ratio.In order to verify the numerical results, an axial flow fan are made. The outer fan'sdiameter is 780 mn. The hub to tip ratio is 0.58. The number of the blades is 17. The expelinentand computational flow code(Navier-Stokes ) are conducted to verify the design condition. Thevelocity and flow direction measurement is done by using a Pitot tube, and also, the claw-typeprobes is used to indicate the velocity direction all over the blades, in front of the rotor, behindthe rotor, behind the stator, and at a point away from the stator 160 mm. The experimental datareveal that the flow direction around the blades is found to agree with the design criterion. Theair velocity and direction in front of the rotor and behind the rotor are very close to one another.Nonetheless, when reducing the flow rate across the fan, the difference is more noticeable. Thiscause of the error may be come from experimental instrument and the assumptions in theanalysis.From this research, inverse designing method for propeller can help reducingdesigning complexity, save time and make the propeller shape suitable with required flow status.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี. สำนักหอสมุด

Address: กรุงเทพมหานคร

Email: info.lib@mail.kmutt.ac.th

Name: วันชัย อัศวภูษิตกุล

Role: อาจารย์ที่ปรึกษา

Created: 2544

Issued: 2008-01-22

Modified: 2559-01-13

วิทยานิพนธ์/Thesis

CallNumber: MEE1536

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมเครื่องกล

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

©copyrights มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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1	MEE1536.pdf	1.74 MB	151	2024-08-29 09:36:26
2	MEE1536ab.pdf	63.52 KB	49	2021-10-05 11:43:35
3	MEE1536ab.txt	2.74 KB	42	2022-03-30 01:50:59

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