Cylinder interior sampling method two-stroke engine scavenging efficiency testing system and method
An efficiency test, two-stroke technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., to achieve the effect of simple calculation process, easy operation and high precision
Inactive Publication Date: 2020-05-12
TIANJIN UNIV
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Problems solved by technology
[0003] The current measurement method for the scavenging efficiency of two-stroke engines cannot meet the needs of actual production. Therefore, it is urgent to develop a test for the scavenging efficiency of two-stroke engines that can meet actual needs, is easy to operate, has high measurement accuracy, and is easy to calculate. System and method
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0051] Experimental conditions: 1000r / min, air intake 400kg / h, the engine is a two-stroke diesel engine, the experimental data are as follows:
[0052] Then the scavenging efficiency is calculated as follows:
[0053]
Embodiment 2
[0055] Experimental conditions: 1000r / min, air intake 202kg / h, the engine is a two-stroke diesel engine, the experimental data are as follows:
[0056] Scavenging efficiency:
[0057]
Embodiment 3
[0059] Experimental conditions: 1500r / min, air intake 202kg / h, the engine is a two-stroke diesel engine, the experimental data are as follows: Scavenging efficiency:
[0060]
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The invention discloses a cylinder interior sampling method two-stroke engine scavenging efficiency testing system acting on an air cylinder. An oil atomizer is arranged on the top of the air cylinder. A sampling probe is arranged on the top of an air cylinder combustion chamber and connected with a sampling head. The sampling head is connected with a combustion analyzer and a computer end througha control cabinet. A testing method is further disclosed and comprises the steps that the pressure and the temperature of the sampling probe are set at the computer end, the negative pressure existsin the sampling probe relative to the interior of the combustion chamber so that sample collection can be continuously conducted, and collected gas samples are conveyed to the sampling head for real-time analysis; and through comparison of the volume concentration of carbon dioxide before combustion and the volume concentration of carbon dioxide after complete combustion, the scavenging efficiencyof a two-stroke engine is finally determined. The cylinder interior sampling method two-stroke engine scavenging efficiency testing system is high in measuring precision, simple in structure and capable of calculating the volume concentration of carbon dioxide in the cylinder.
Description
Technical field [0001] The invention belongs to the field of engine testing, and particularly relates to a two-stroke engine scavenging efficiency test system and method using in-cylinder sampling method. Background technique [0002] Two / four-stroke conversion is a hot spot in current engine research. In-depth study and optimization of the two-stroke mode of the two-stroke conversion engine will help improve engine performance. The scavenging efficiency characterizes the ratio of the fresh air mass in the cylinder to the total mass of the gas in the cylinder after the air exchange is completed. The engine's air exchange performance is related to the scavenging efficiency, so the scavenging efficiency of the engine in the two-stroke mode is measured Vital. [0003] The current measurement methods for the scavenging efficiency of two-stroke engines cannot meet the needs of actual production. Therefore, it is urgent to develop a two-stroke engine scavenging efficiency test that can ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F02B75/02F02B77/08
CPCF02B75/02F02B77/08F02B77/081F02B77/084F02B2075/025
Inventor 裴毅强叶自旺许锴秦静王晨晰董蒙蒙彭忠张启锐
Owner TIANJIN UNIV
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