The paper presents a type of observer based on reduced to minimum set of engine parameters measured directly: turbine-compressor rotational speed, engine inlet air pressure and temperature and atmospheric pressure. Results of application in analysis of data recorded during engine operation in non-stationary states of SO-3 engine (powering TS-11 Iskra aircraft) are presented. Possibilities of th...

Kees de Blok proposed a “hybrid configuration” travelling wave thermoacoustic engine and his prototype using atmosphere air as the working gas achieved an onset temperature difference as low as 65 K. However, no further research work has been reported on this type of thermoacoustic engine to reveal whether this type of engine can achieve higher efficiency, or how to couple it with acoustic load...

investigations were carried out to evaluate the performance of direct injection diesel engine with medium grade low heat rejection (lhr) combustion chamber and 3 mm air gap insulated piston, 3 mm air gap insulated liner, and ceramic coated cylinder head [ceramic coating with the thickness of 500 µ was made on the inside portion of the cylinder head].the engine had different operating conditions...

Engine life and effectiveness can be improved with effective cooling. The cooling mechanism of the air cooled engine is mostly dependent on the fin design of the cylinder head and block. The heat is conducted through the engine parts and convected to air through the surfaces of the fins. Insufficient removal of heat from engine will lead to high thermal stresses and lower engine efficiency. As ...

Engine knock is an undesired phenomenon in spark ignited internal combustion engines; such as a gasoline engine running the Otto cycle. Knocking originates from abnormal combustions at timings other than those decided by controlled ignition. Individual abnormal combustions of this type is also referred to as auto-ignition. Knocking is not only a limitation on engine efficiency and thus of envir...

A method of investigating the effects of high angle of attack (AOA) flight on turbofan engine performance is presented. The methodology involves combining a suite of diverse simulation tools. Three-dimensional, steady-state computational fluid dynamics (CFD) software is used to model the change in performance of a commercial aircraft-type inlet and fan geometry due to various levels of AOA. Par...

The Stirling cycle and related terminology is defined. Selected contemporary research involving the cycle in environmentally friendly applications is cited. Three conventional engine configurations that utilize a reciprocating power piston and crank shaft (the Alpha, Beta, and Gamma) are characterized, in terms of minimum number of components, advantages, and disadvantages. A new type of Stirli...