The paper extends a mean value model of a parallel turbocharged internal combustion engine with a crank angle resolved cylinder model. The result is a 0D engine model that includes the pulsating flow from the intake and exhaust valves. The model captures variations in turbo speed and pressure, and therefore variations in the compressor operating point, during an engine cycle. The model is used ...

this study mainly focuses on enhancing the overall efficiency of gas transmission networks. the authors developed a model with detailed characteristics of compressor and pressure reduction stations. following this, they suggested three different systems with gas turbine including: organic rankine cycle (orc), air bottoming cycle (abc), and abc along with steam injection (si-abc). in addition, u...

This paper presents a new analysis of the effects of ambient temperature variations on the surge characteristics of turbo heat pumps. To this end, an analytical model capable of predicting unsteady behavior of surge in turbo heat pumps has been developed. In compression systems, surge is mostly caused by the compressor work exceeding the mechanical inertia of the system. In refrigeration system...

In the rapidly developing automotive technology, efforts to achieve high performance with less fuel consumption is one of most important issues today. The purpose supercharged systems developed for this reason send more air into cylinder. For engine and low exhaust emission values, intake temperature, which heated in turbo-compressor has oxygen concentration (the amount unit air) decreased, mus...

Gas compression in a positive displacement (PD) type piston engine, or piston compressor, has long been modeled as a quasi-static process in which the piston is assumed to move infinitely slow inside a cylinder. The gas compression mechanism is therefore regarded as being governed by the basic thermodynamic principles. Energy transfer is accomplished quasi-statically with a piston reducing the ...

Performance of a gas turbine mainly depends on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. This is precisely the reason why on hot days, when air is less dense, power output falls. The objective here is to assess the advanced systems applied in reducing the gas turbine intake air temperature and examine the merits from integration of the ...

As is widely known, internal combustion engines are not able to complete the expansion process of gas inside cylinder, causing theoretical energy losses in order 20%. Several systems and methods have been proposed implemented recover unexpanded energy, such as turbocharging, which partially exploits this compress fresh intake charge, or turbo-mechanical turbo-electrical compounding, where amoun...

A modeling of a turbo air compressor system (TACS), with multi-level inverter for driving variable speed, combining an electrical model electric motor drive (EMDS) and mechanical compressor, is essential to accurately analyze dynamics characteristics. Compared the model, has short sampling time due high frequency switching operation numerous power semiconductors inside inverter. This causes pro...

In many cases it is necessary to judge the stability behavior of a specific compressor. This might be the OEM checking the feasibility of a proposed compressor layout or it might be the user judging one of his machines which causes troubles in operation. API 617 suggests a stability level I or level II analysis. The shortcoming of the level I analysis is that it considers only the global cross-...