Study on distributing Pressure and Velocity on Exhaust Variable Valve Face of Back Pressure

Abstract

Me c h a n i c a lE n g i n e e r i n g ,Gr a d u a t eS c h o o l ,Ko n g j uNa t i o n a lUn i v e r s i t y 2 Di v i s i o no fMe c h a n i c a l& Au t o mo t i v eE n g i n e e r i n g ,Ko n g j uNa t i o n a lUn i v e r s i t yAbstract Environmental emission of recent automobile is drastically enhanced that it is one of the obvious assignments of exhaust system. This study is a purpose to establish of influence distribution on maxima and minima through the location of pressure on exhaust variable valve. The experiment are checked with real angles using camera which exhaust variable valve is opened side of point. Data has extracted to opening angles with internal flow, pressure. Exhaust variable valve through the floating analysis was analyzed the characteristic of location point about pressure and velocity. The pressures indicated the reduced results internal pressure within muffler. The velocity indicated an opposite results and vibration state of valve was verified to be operated as high speed from lower section. The conclusion to obtain from this study was found out the result to make the optimum back pressure condition as more increasing pressure distribution on valve face if the velocity location attracted by bottom point in order to improve for engine performance.

Performance Analysis on Variable Injectors to Improve the Internal Velocities and Flow Rates in a Fuel System for Natural Gas Vehicles

“…The injection technology of the injector for natural gas should be produced so that the mass flow is allowed to be injected while flowing into the injection hole in the case of applying high pressures inside the injector [4]. The performance of the injector is characterized by production such that weight and internal resistance are reduced while cracking or damage does not occur in high-pressure conditions or long-time use [5]. However, while structural material analyses for single items and analytical methods for defects are being consistently implemented [6], problems are occurring where performance for the flow changed inside the injector and cannot be experimentally visualized in the injector which itself is produced by a combination of single items [7,8].…”