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Visualization of Air-Natural Gas Mixing Process in the Intake Manifold for Natural Gas Engine

Author: GongYingLi
Tutor: ZhangHuiMing
School: Tianjin University
Course: Power Machinery and Engineering
Keywords: Natural gas engines Intake manifold Ratio adjustment mixer Venturi tube mixer Mixing process Schlieren method
CLC: TK43
Type: Master's thesis
Year: 2003
Downloads: 326
Quote: 10
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Abstract


With the growing worldwide oil resources gradually poor and atmospheric pollution , natural gas engines with efficient, low-pollution combustion characteristics of a wide range of development and application of the gas engine . In the process of development and application of natural gas (CNG) engines , the most critical technology is the way of natural gas supply , largely affects the engine power , economy , security , reliability , and emissions performance . This article describes the overview of the development of natural gas engines and gas supply systems . Schlieren method to carry out the intake pipe natural gas - air mixing process visualization , shooting a transparent intake pipe natural gas - air mixing process and natural gas jet instantaneous image . For improving the mixing effect of the natural gas and air in the intake pipe , the authors designed a a gas primer trachea . Compared the effects of the first proportional regulator mixers and venturi mixer mixing . Found that two mixer under the same condition different mixing uniformity . The lead the tracheal was found : the nozzle hole jet parallel to the central axis of the direction of the intake manifold will lead to poor mixing . The number of nozzle holes , the diameter of the spray holes , and the air flow velocity is the important parameter to affect the gas mixing process . The visualization study found OF improved venturi tube mixer mixing effect is better than ordinary venturi tube mixer , wing tube mixing is better than the cylindrical primer trachea . The jet tube experiments found : jet will form in the tube flow stratification , and sustained a long distance in the tube . Nozzle diameter, jet velocity , the air flow and the throttle opening degree of control of the diffusion of the gas jet flow has an important influence.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Gas fueled internal combustion engines
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