Results 241 to 250 of about 407,181 (305)

Environmental and enviroeconomic analyses of two different turbofan engine families considering landing and take-off (LTO) cycle and global warming potential (GWP) approach

Energy Conversion and Management, 2021
In this study, environmental and enviroeconomic analyses regarding two different turbofan engine families that are commonly used in commercial aircrafts are carried out at Landing and Take-Off (LTO) cycle involving take-off, climb-out, approach and idle ...
H. Aygun, H. Çalışkan
semanticscholar   +1 more source

Prediction and optimization of power output of single screw expander in organic Rankine cycle (ORC) for diesel engine waste heat recovery

, 2021
The output characteristics of single screw expander has a direct and crucial influence on the performance of organic Rankine cycle (ORC) system. In this paper, a machine learning prediction model driven by experimental data is developed and applied to ...
Xu Ping, Fubin Yang, Hongguang Zhang, Wujie Zhang, Jian Zhang, Gege Song, Chongyao Wang, B. Yao, Yu-ting Wu   +8 more
semanticscholar   +1 more source

Analysis of dynamic characteristics and sensitivity of hydrogen-oxygen expansion cycle rocket engine system

Acta Astronautica, 2021
The success of the launch mission depends on the dynamic characteristics of the rocket engine system, while the engine development process is based on the parameter sensitivity analysis.
Chuangyu Zhou, Nanjia Yu, Jue Wang, Ping Jin, Guobiao Cai   +4 more
semanticscholar   +1 more source

Multi-zone combustion modeling for the prediction of diesel engine cycles and engine performance parameters

Applied Thermal Engineering, 2008
Abstract In the presented study, the aim is to develop a complete cycle model and to prepare a computer code for determining complete cycle, performance characteristics, and exhaust emissions of diesel engines. For this purpose, a computer program has been developed. To compute diesel engine cycles, zero-dimensional intake and exhaust model developed
Zehra Şahin, Orhan Durgun
openaire   +1 more source

Optimum Cycle Parameters for Turbofan Engines

Volume 1A: General, 1970
This paper presents closed-form solutions for optimum compressor pressure ratio, bypass ratio and fan pressure ratio, given the turbine inlet temperature, component efficiencies and flight Mach number for a turbofan engine. In addition a simple procedure is outlined for obtaining the optimum combination of these quantities and a sample calculation is ...
openaire   +1 more source

Thermodynamic analysis and performance optimization of the supercritical carbon dioxide Brayton cycle combined with the Kalina cycle for waste heat recovery from a marine low-speed diesel engine

Energy Conversion and Management, 2020
With the continuous rise in world oil prices and increasing environmental awareness, how to improve ship energy efficiency and reduce ship pollution emissions has become a common concern of the shipping industry.
Yongming Feng, Zhiqiang Du, Majed Shreka, Yuanqing Zhu, Song Zhou, Wenping Zhang   +5 more
semanticscholar   +1 more source

An Analysis of Cycle-by-cycle Fluctuation in Combustion Parameter in CI Engine Operation for Various Bio-fuels

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2011
Abstract The cycle-by-cycle fluctuations in peak pressure of combustion in a CI engine were studied for lower and higher blends of diesel and ester, and water-in-ester emulsions, at four injection timings and three injection pressures using coefficient of variation.
S. Bekal, T. P. Ashok Babu
openaire   +1 more source

Optimization of System Parameters for Liquid Rocket Engines with Gas-Generator Cycles

Journal of Propulsion and Power, 2010
System design of liquid rocket engines must consider engine performance, weight, cost, and reliability requirements. A general design optimization framework has been developed in this paper to select the best system parameters for liquid rocket engines with gas-generator cycles. The object is to maximize the specific impulse and vacuum thrust-to-weight
Guobiao Cai, Jie Fang, Yuntao Zheng, Xiaoyan Tong, Jun Chen, Jue Wang   +5 more
openaire   +1 more source

Correlations between cycle-to-cycle variations and combustion parameters of a spark ignition engine

Applied Thermal Engineering, 2004
The coefficient of covariation (COV) of the in-cylinder pressure is determined on each crank angle of a number of cycles, in the case of a natural gas feed SI engine operating under lean conditions. The resulting curve of COV versus crank angle is explored.
openaire   +1 more source

Factorial Analysis of Otto Cycle Engine Operating Parameters on the Exhaust Gases Temperature

SAE Technical Paper Series, 2020
<div class="section abstract"><div class="htmlview paragraph">Internal combustion engines are thermal machines that produce work by burning fuel and have a high power-to-weight ratio. A large part of the energy released in the combustion is lost with the exhaust gases and therefore is not converted to useful work. Thus, the understanding of
Guilherme A. Emerick, Daniel Z. Carmago, Jordan D. Cussuol, Matheus A. Limas, Alan P. S. Siqueira, Lucas H. P. Deoclecio, Filipe A. F. Monhol   +6 more
openaire   +1 more source