Accession Number:

AD0685491

Title:

INVESTIGATION OF THE OPERATING PROCESS OF AN ENGINE WITH COMBUSTION CHAMBER IN THE PISTON,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1968-08-20

Pagination or Media Count:

15.0

Abstract:

The 1Ch 8.511 engine is a single-cylinder unit put out by the Riga Diesel Plant. A study was made of the feasibility of direct injection with the combustion chamber in the piston in this type of engine. A diagram of the modified combustion chamber with a compression ratio of 15.8 is shown. A new cylinder head was used together with the revised cylinder, which was made of aluminum. The compression ratio was changed by increasing the depth of the chamber. The axis of the chamber was displaced by 5 mm from the cylinder axis toward the spray unit so that the tip of the unit would reach the chamber. The engine was otherwise left unaltered. Various spray units with from one to four nozzle apertures were used in the tests. The test stand was equipped with an equalizing dynamo, systems for fuel supply and measuring the rate of fuel flow, engine cooling regulation, exhaust gas temperature measurement, registration of the initiation and termination of fuel spray. A stroboscopic tachometer was used for setting and monitoring the engine speed. In studying the effect of the number of nozzle apertures on operational indices, the diameters were varied to give approximately the same total cross section in all cases. It was found that optimum operating conditions are achieved with a four-aperture spray unit and a compression ratio of 15.8 without axial vorticity. Conversion to direct injection results in increased indicator efficiency chiefly due to reduced losses in cooling and incomplete combustion. Author

Subject Categories:

  • Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE