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ITS » Undergraduate Theses » Teknik Mesin
Posted by dewi007 at 05/12/2008 10:26:36  •  14278 Views


PENGENDALIAN PASIF TERHADAP BOUNDARY LAYER DI FLAT-WALLED DIFFUSER 20 DENGAN SUCTION DAN BLOWING MELALUI RECTANGULAR SLOT

PASSIVE BOUNDARY LAYER CONTROL IN FLAT-WALLED DIFFUSER 20 WITH SUCTION AND BLOWING THROUGH RECTANGULAR SLOT

Author :
RINENGGO NUGROHO 




ABSTRAK

Difuser merupakan salah satu komponen teknik yang berfungsi untuk meningkatkan tekanan aliran fluida dengan cara memperlambat kecepatan aliran. Adanya peningkatan tekanan menghasilkan adverse pressure gradient yang menghambat aliran sehingga boundary layer berkembang dengan cepat dan terjadi separasi aliran. Hal tersebut mengakibatkan performa difuser menjadi drop. Oleh karena itu sudah banyak penelitian yang difokuskan untuk mengendalikan perkembangan boundary layer di dalam difuser salah satunya adalah dengan simultaneous suction dan blowing melalui rectangular slot. Penelitian ini bertujuan untuk mengetahui pengaruh suction dan blowing terhadap performa difuser yang dinyatakan sebagai pressure recovery coefficient Cp. Test section pada penelitian ini berupa flat-walled diffuser dengan sudut divergensi 2 20 tinggi inlet W1 50 mm lebar span b 100 mm slenderness LW1 10 dan area ratio A2A1 364. Bilangan Reynolds yang digunakan berdasarkan tinggi inlet adalah ReW1 56 x 104 dan ReW1 87 x 104. Pengendali pasif berupa slot blowing dan suction ditempatkan secara simetri pada upper dan lower diverging wall masing masing pada xL 01 dan xL 05. Tiga sudut kemiringan slot blowing sebesar 45 30 dan 15 digunakan pada penelitian ini. Tekanan stagnasi diukur dengan menggunakan Pitot tube pada beberapa cross section untuk mendapatkan distribusi profil kecepatan rata - rata. Tekanan statis diukur dengan wall pressure tap yang ditempatkan mulai diffuser inlet xL 0 sampai diffuser outlet xL 1 dengan jarak antar tap sebesar 5 mm untuk mendapatkan distribusi wall pressure recovery coefficient Cp. Data tekanan stagnasi bersama dengan tekanan statis digunakan untuk menghitung harga skin friction coefficient Cf berdasarkan metode Preston tube. Jurusan Teknik Mesin FTI - ITS Tugas Akhir Konversi Energi Hasil yang dicapai pada penelitian ini adalah adanya peningkatan pressure recovery coefficient Cp sebesar 15 dan 10 pada bilangan Reynolds rendah untuk sudut kemiringan slot blowing 45 dan 30. Sedangkan pada bilangan Reynolds yang tinggi tidak dihasilkan peningkatan Cp sama sekali untuk seluruh harga sudut blowing yang digunakan.


ABSTRACT

Diffuser is one of the engineering components whose function is to raise the static pressure of the fluid flow by slowing down its velocity. The pressure increasing results in adverse pressure gradient that retards the near wall flow more significantly. As a consequence the boundary layer grows more rapid than usual and at some cases the separation will occur. Those phenomena make diffuser performance decreases. Therefore there have been many experiments conducted in diffuser in order to obtain the better performance of the diffuser including the application of suction and blowing through rectangular slot. This experiment is intended to observe the effect of suction and blowing to diffuser performance that is defined as pressure recovery coefficient Cp. The test section was a flat-walled diffuser with divergence angle 2 20 inlet height W1 50 mm span width b 100 mm slenderness LW1 10 and area ratio AR 364. The experiments were performed at Reynolds number on inlet height ReW1 of 56 x 104 and ReW1 87 x 104. Symmetrical passive control is located at upper and lower diverging walls. The blowing slot is at xL 01 whereas the suction slot is at xL 05. Three values of blowing angle 45 30 and 15 are used in this study. Stagnation pressure was measured using Pitot tube at several cross sections in order to obtain mean velocity profile distribution. Static pressure was measured using pressure tap in the range of xL 0 and xL 1 with an interval between two consequtive taps of 5 mm. Wall pressure recovery distribution was then obtained. Next wall shear stress was measured using Preston tube method. At ReW1 56 x 104 with blowing angle of 45 and 30 there are maximum pressure recovery coefficient increasings of Jurusan Teknik Mesin FTI - ITS Tugas Akhir Konversi Energi approximately 15 and 10 percent respectively. On the contrary at ReW1 87 x 104 there is no Cp improvement at all values of blowing angles.



KeywordsDifuser; pressure recovery coefficient (Cp); suction; blowing; tegangan geser dinding
 
Subject:  Mekanika fluida
Contributor
  1. Ir. SUTARDI, M.Eng. PhD.
Date Create: 05/12/2008
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Undergraduate-3100008032090
Collection ID: 3100008032090
Call Number: RSM 620.106 Nug p


Source
Undergraduate Theses of Mechanical Engineering, RSM 620.106 Nug p, 2007

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