Engineering Mechanics Institute Conference 2013

Full Program »

Dynamic Characteristics of Three Stage Air Valves

PDF Abstract
View File
pdf
55KB
DOCX Abstract
View File
docx
161KB

Hassan Warda
Alexandria University
Egypt

Ihab Adam
Alexandria University
Egypt

Ahmed Rashad
Alexandria University
Egypt

Khaled Elgohary
Maryland University
United States

Abstract:
Dynamic Characteristics of Three Stage Air Valves
Warda H. A.*, Adam I. G. *, Rashad A. B.*, and Elgohary K. R.**

The performance of 3 stage air valve has been investigated both experimentally and numerically. Throughout this work, more understanding of the dynamic behavior of air valves during transient is achieved. A wide range of tests were conducted, the aim of which were to obtain a graphical representation of the differential pressure versus water discharge rate characteristics for different valve float configurations and to determine the exact point at which dynamic closure occurs, whenever it occurs, and to determine the peak pressure induced when a flow of water column reaches and closes the valve.
The test rig for water discharge tests was constructed from a transparent pipe, and also transparent valve was used to allow visual interpretation of the valve behavior during transients using high speed camera. The rig was interfaced with a high pressure air/water supply in order to obtain the necessary pressure difference to vary the water column velocity. Pressure record was monitored and recorded at different locations along the pipe and at the valve. Water column velocity was also recorded via an ultrasonic clamp on flow meter. The outputs of the various sensors were monitored by means of a data acquisition device.
The experimental results have been compared with the results of a numerical model that has been developed based on the method of characteristics with its ability to simulate complex pipe systems, unsteady friction, viscoelastic pipes and column separation. The air vent was is incorporated in the model as a boundary condition.


*Faculty of Engineering, Alexandria, Egypt
**Maryland University, maryland, USA

 

Powered by OpenConf®
Copyright ©2002-2012 Zakon Group LLC