High-pressure spray characteristic testing system for use at high temperature and under high back pressure

Abstract

The invention discloses a high-pressure spray characteristic testing system for use at a high temperature and under a high back pressure. The testing system consists of a constant volume combustion chamber, a heating system, an ignition and fuel injection system, a synchronous control system, a transient high-temperature and high-pressure measurement system and a high-speed camera system. Before testing, the constant volume combustion chamber is heated to a target temperature by the heating system, fuel and air are mixed, and the mixed gas pre-burns to establish a high-temperature and high-back-pressure condition. In a high-temperature and high-back-pressure environment, a fuel injection system injects diesel into the constant volume combustion chamber, temperature and pressure sensors record relevant data, and the high-speed camera system shoots a spray form, thereby completely recording spray characteristic data. The testing system provided by the invention can detect the spray characteristics in a real engine environment. Fuel is injected into the constant volume combustion chamber firstly, and burns in the constant volume combustion chamber to increase the temperature and pressure in the constant volume combustion chamber. The testing environment is a high-temperature and high-back-pressure environment, which is consistent with an actual engine environment.

Description

technical field [0001] The invention relates to the field of diesel spray characteristic testing, in particular to a high-pressure spray characteristic testing system under high temperature and high back pressure. [0002] technical background [0003] Diesel engine, as an internal combustion engine with high thermal efficiency, is widely used in the fields of vehicles, agriculture and ship power. A large amount of NO is emitted during the combustion process of a diesel engine x and particulate pollution. With the improvement of emission regulations, the emission of pollutants must be strictly controlled, so it is very important to optimize the combustion process and improve the emission of diesel engines. During the combustion process of a diesel engine, the spray atomization of fuel directly affects the formation of fuel-air mixture, which in turn affects the quality of combustion, and ultimately affects the economic efficiency, power and emissions of the engine. Most of...

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Problems solved by technology

Most of the test systems for spray atomization focus on testing under normal temperature and pressure or high back pressure, which is inconsistent with the actual conditions of spray in diesel engines. Therefore, it is necessary to study the high-pressure spray characteristics test system under high temperature and high back pressure necessary

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