Abstract
The aim of this study is to search the unsteady flows due to shut-off of the pump. Pressures have been measured at the immediate outlet of the pump. Valve and elbow head losses were determined for different steady state discharges. Thus, the numerical values and empirical expressions for loss coefficients versus velocities were derived. Numerical results were obtained by computer program written in Fortran language using the method of characteristics. In numerical solution, the pump behavior which constitutes the upstream boundary condition is expressed by means of head balance and speed change equations written in terms of dimensionless parameters. An acceptable agreement is observed between theoretical and experimental results. Since the discrepancy between theoretical and experimental results is negligible, one can deduce that the used method and approaches are convenient and they can be applied to real-life engineering projects.
Abstract
(Bu çaly?ma BYLYMDE MODERN YÖNTEMLER SEMPOZYUMU 2010'da sunulmustur) Bu çaly?mada pompanyn duraklamasy ile olu?an kararsyz akymlar teorik ve deneysel olarak ara?tyrylmy?tyr Basynçlar pompa çyky?ynda ölçülmü?tür. Vana ve dirsek kayyplary de?i?ik debiler için ölçülerek yerel kayyp katsayylarynyn de?erleri do?rudan elde edilmi? ve bu katsayylar için hyza ba?ly olarak de?i?en ampirik ba?yntylar türetilmi?tir. Teorik sonuçlar, Karakteristikler Yöntemi kullanylarak ve Fortran dilinde yazylmy? bilgisayar programy ile elde edilmi?tir. Sayysal çözümde memba synyr ?artyny olu?turan pompanyn davrany?y boyutsuz parametreler kullanylarak yazylmy? yük denge ve hyz de?i?imi denklemleriyle ifade edilmi?tir. Deneysel sonuçlaryn teorik sonuçlarla uyumlu oldu?u görülmü? olup gözlenen farklylyklaryn ihmal edilebilir mertebede olmasy kullanylan yöntem ve yakla?ymlaryn uygun oldu?unu ve uygulamadaki mühendislik projelerinde kullanylabilece?ini göstermektedir.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Computer Engineering |
| Authors | |
| Publication Date | February 1, 2011 |
| Published in Issue | Year 2011 Volume: 6 Issue: 1 |