In order to improve the combustion performance of a ramjet under low temperature and pressure, gliding arc plasma actuator was designed based on typical evaporation flameholder. The discharge characteristics, as well activating effect single-channel three-channel different carrier gas flow rates, were studied. Results show that with increase in rate, average duration becomes shorter, while powe...

Reducing the exhaust emissions of an spark ignition engine by means of engine modifications requires consideration of the effects of these modifications on the variations of crankshaft torque and the engine roughness respectively. Only if the roughness does not exceed a certain level the vehicle do not begin to surge. This paper presents a method for controlling the air-fuel ratio for a lean bu...

Experiments were conducted to evaluate the performance of a low heat rejection (LHR) diesel engine. Performance parameters and emission levels were determined at various magnitudes of brake mean effective pressure. Combustion characteristics of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package at peak load...

In the work under consideration, using an experimental stand formed by a cylindrical coil, modes of air movement through flue ramjet steam boiler were investigated. Experimental studies have revealed shortcomings in operation direct-flow and proposed ways to increase heat transfer turbulizing gas-air flow convective part flue. The Ansys programmable engineering environment was used simulate exc...

this study aimed to evaluate persian search engines based on the criteria obtained from alexa databank using correspondence analysis. through searching the web, 23 search engines were found, which due to their cease and no coverage by alexa, this number was reduced to 16. data analysis revealed that ghatreh search engine occupied a high rank in most of attributes like traffic rank, time spent o...