Research on the Turbocharger Technology of Piston Aircraft Engine

2013 ◽  
Vol 457-458 ◽  
pp. 531-535
Author(s):  
Zhong Jian Pan ◽  
Qing Hua He ◽  
Yong Guo ◽  
Yu Ming Zhao ◽  
Jing Yang
Keyword(s):  
Simulation Model ◽  
High Altitude ◽  
Gas Flow ◽  
State Power ◽  
Aircraft Engine ◽  
Cylinder Pressure ◽  
Piston Engine ◽  
Ground Condition

The supercharger technology of piston aviation engine determines its flight capabilities, and then establishes a turbocharger simulation model of an aviation piston engine. After simulating the engine ground features and 5000-meter altitude characteristics, and comparing the efficiency of compressor and turbocharger in different environments, after the installation of mechanical supercharger, gas flow has been improved, the cylinder pressure decreased about 10% compared with ground condition and engine altitude state power is restored, even 20,000 feet Power restored to 80%, which can meet the needs of high-altitude flight.

scholarly journals Simulation Research of Aircraft Piston Engine Rotax 912

2019 ◽  
Vol 252 ◽  
pp. 05007 ◽  
Author(s):  
Łukasz Grabowski ◽  
Ksenia Siadkowska ◽  
Krzysztof Skiba
Keyword(s):  
Combustion Process ◽  
Engine Performance ◽  
Aircraft Engine ◽  
Basic Unit ◽  
Piston Engine ◽  
Engine Operation ◽  
Simulation Research ◽  
One Dimensional ◽  
Operation Process ◽  
Model Aircraft

This paper reports the results of simulation works of Rotax 912 aircraft piston engine, which is a basic unit in most ultra-light aircrafts. The method for preparing the model aircraft engine operation process was presented. Simulation tests were carried out in the AVL Boost programme. The programme allows a full use of zero-dimensional and one-dimensional modelling. It also allows a comparison of other engine models. The developed model has enabled us to simulate the flow of air through the inlet pipes, carburettors, valves and combustion process. The preparation of the model required us to enter parameters that are not available in the manufacturer's catalogue, therefore, necessary measurements and analysis of the engine parts were carried out on a laboratory bench. The calculations in the AVL Boost programme were carried out in the conditions determined for the selected BMEP values with the objective of characterising the engine performance by determining its power, torque and fuel consumption.

Regional cerebral blood flow and tissue oxygenation during hypocarbia in geese

1992 ◽  
Vol 263 (2) ◽  
pp. R221-R225 ◽  
Author(s):  
P. E. Bickler ◽  
D. Julian
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
High Altitude ◽  
Regional Cerebral Blood Flow ◽  
Gas Flow ◽  
Regional Cerebral Blood ◽  
Local Blood Flow ◽  
Tissue Po2 ◽  
O2 Delivery ◽  
Kinetics Of

Very low arterial CO2 tension (PaCO2) experienced by birds during high-altitude flight may result in cerebral vasoconstriction and reduced cerebral O2 delivery. To examine this possibility, we measured regional cerebral blood flow (CBF) and tissue PO2 in pentobarbital-anesthetized geese (Anser domesticus). Twenty-five-micrometer Teflon-coated platinum electrodes for H2-clearance measurements of local blood flow or tissue PO2 were implanted in the cerebral cortex in 11 geese. Tissue H2 and O2 were measured by voltage clamping the electrodes at +0.30 and -0.5 V, respectively. Washout kinetics of H2 gas administered via unidirectional lung ventilation was used to calculate local blood flow for those electrodes exhibiting one- or two-compartment washout kinetics of H2 (128 of 296 washouts in 31 electrodes). PaCO2 was controlled between 8 and 55 mmHg by altering pulmonary gas flow or by adjusting inspired PCO2. CBF decreased as PaCO2 fell from 50 to 20 mmHg but did not decrease further as PaCO2 was reduced below 20 mmHg. CBF was uniformly distributed in different regions of the cortex. Despite the plateau in CBF during severe hypocapnia, tissue PO2 continued to decline as PaCO2 fell below 20 mmHg. Severe alkalosis may limit cerebral O2 delivery in birds during high-altitude flight.

Research of NOx Emissions Characteristic of Engine Fuelled with M40

2011 ◽  
Vol 382 ◽  
pp. 22-25
Author(s):  
Xin Guang Li ◽  
Bing Yuan Han ◽  
Rong Hai Yang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Simulation Model ◽  
Compression Ratio ◽  
Gasoline Engine ◽  
Volume Ratio ◽  
Nox Emissions ◽  
Cylinder Pressure ◽  
Variable Parameters ◽  
Vehicle Engine

A numerical simulation model for gasoline engine was established by GT-POWER in order to study the NOx emissions characteristic of vehicle engine fuelled with M40 (the methanol and the gasoline in volume ratio 40∶60) and was validated by Experimental data. Based on the model, the variable parameters study including air-fuel radio, compression radio and ignition advance angle were carried out. The model results showed that the compression radio and the air-fuel radio played an important role during the NOx emissions characteristic. There is a significant improvement of the NOx emissions with the compression ratio increases. The cylinder pressure increased with the improvement of the compression ratio brought out the NOx emissions rise. With the improvement of the air-fuel ratio, NOx emissions increased first and then decreased. A larger ignition advance angle can increase the pressure and the temperature of the cylinder.

Removal of hydrogen sulfide from an anaerobic biogas using a bio-scrubber

1997 ◽  
Vol 36 (6-7) ◽  
pp. 349-356 ◽  
Author(s):  
Sosuke Nishimura ◽  
Motoyuki Yoda
Keyword(s):  
Hydrogen Sulfide ◽  
Simulation Model ◽  
Biological Treatment ◽  
Gas Flow ◽  
Treatment Process ◽  
Aeration Tank ◽  
Wastewater Treatment Process ◽  
Bubble Tray ◽  
Sulfur Oxidizing ◽  
Biological Treatment Process

A novel biological treatment process for removing hydrogen sulfide from anaerobic biogas using a bio-scrubber has been developed. The treatment process is composed of a gas/liquid contact tower and an aeration tank. The biogas from an anaerobic wastewater treatment process is introduced into a multiple-bubble-tray contact tower (bio-scrubber) and scrubbed with activated sludge liquor from an aeration tank. The sludge liquor containing sulfides is then returned to the aeration tank, where the sulfide is oxidized to sulfate by sulfur-oxidizing bacteria such as Thiobacillus. The contact tower is designed to be air tight in order to prevent air from mixing into the biogas used as a fuel. A simulation model was developed to calculate effluent gas concentrations from the contact tower, incorporating input parameters such as influent hydrogen sulfide concentrations, gas flow rates, and gas/liquid ratios. Using the simulation model, design criteria were calculated and a full-scale plant for treating biogas from a UASB process for potato processing wastewater was constructed. The data shows that the hydrogen sulfide in the biogas was effectively reduced from 2,000 ppm to less than 20 ppm.

scholarly journals Design of lubrication system, design of motor bed, selecting of propeller for aircraft piston engine

2021 ◽  
Author(s):  
Michal Suk ◽  
◽  
Jozef Čerňan
Keyword(s):  
System Design ◽  
Design Procedure ◽  
Aircraft Engine ◽  
Scientific Article ◽  
Lubrication System ◽  
Piston Engine ◽  
Safety Requirements ◽  
Technical Requirements ◽  
Different Types ◽  
The Individual

I will briefly address the three orientations of my paper in this scientific article. I will not go into details in the article. In the first part I will briefly describe the design procedure of a piston engine lubrication system, the requirements that a lubrication system should meet with respect to different types of piston engines and their focus, elements of the lubrication system and the properties of oils as lubricating fluids.In the next part I will describe the types and constructions of aircraft engine beds, technical requirements for aircraft engine beds and individual loads that the aircraft engine bed must withstand. In the last part I will focus on aircraft propellers. I will explain the basic principle of the propeller, the individual rules for selecting a propeller for a piston engine, safety requirements for an aircraft propeller and the dividing of basic types of aircraft propellers for aircraft piston engines.

scholarly journals Diatom-oxygen isotope record from high-altitude Lake Petit (2200 m a.s.l.) in the Mediterranean Alps: shedding light on a climatic pulse at 4.2 ka

2019 ◽  
Vol 15 (1) ◽  
pp. 253-263 ◽  
Author(s):  
Rosine Cartier ◽  
Florence Sylvestre ◽  
Christine Paillès ◽  
Corinne Sonzogni ◽  
Martine Couapel ◽  
...  
Keyword(s):  
High Altitude ◽  
Oxygen Isotope ◽  
Gas Flow ◽  
Isotope Composition ◽  
Mediterranean Area ◽  
Western Mediterranean ◽  
Southern Alps ◽  
Precipitation Regime ◽  
The Mediterranean ◽  
High Altitude Lake

Abstract. In the Mediterranean area, the 4.2 ka BP event is recorded with contrasting expressions between regions. In the southern Alps, the high-altitude Lake Petit (Mercantour Massif, France; 2200 m a.s.l.) offers pollen and diatom-rich sediments covering the last 4800 years. A multi-proxy analysis recently revealed a detrital pulse around 4200 cal BP due to increasing erosion in the lake catchment. The involvement of a rapid climate change leading to increasing runoff and soil erosion was proposed. Here, in order to clarify this hypothesis, we measured the oxygen isotope composition of diatom silica frustules (δ18Odiatom) from the same sedimentary core. Diatoms were analysed by laser fluorination isotope ratio mass spectrometry after an inert gas flow dehydration. We additionally enhanced the accuracy of the age–depth model using the Bacon R package. The δ18Odiatom record allows us to identify a 500-year time lapse, from 4400 to 3900 cal BP, where δ18Odiatom reached its highest values (>31 ‰). δ18Odiatom was about 3 ‰ higher than the modern values and the shifts at 4400 and 3900 cal BP were of similar amplitude as the seasonal δ18Odiatom shifts occurring today. This period of high δ18Odiatom values can be explained by the intensification of 18O-enriched Mediterranean precipitation events feeding the lake during the ice-free season. This agrees with other records from the southern Alps suggesting runoff intensification around 4200 cal BP. Possible changes in other climatic parameters may have played a concomitant role, including a decrease in the contribution of 18O-depleted Atlantic winter precipitation to the lake water due to snow deficit. Data recording the 4.2 ka BP event in the north-western Mediterranean area are still sparse. In the Lake Petit watershed, the 4.2 ka BP event translated into a change in precipitation regime from 4400 to 3900 cal BP. This record contributes to the recent efforts to characterize and investigate the geographical extent of the 4.2 ka BP event in the Mediterranean area.

Motion Simulation of Mountain High Altitude Work Vehicle Based on UG/Motion

2012 ◽  
Vol 220-223 ◽  
pp. 526-530
Author(s):  
Hao Wu ◽  
Xue Wei Wu ◽  
Hong Jun Wang ◽  
Hong Fu Zhang
Keyword(s):  
Simulation Model ◽  
High Altitude ◽  
Mechanical Design ◽  
Virtual Model ◽  
Basic Process ◽  
Motion Simulation ◽  
Work Efficiency ◽  
Model And Simulation ◽  
Simulation Results ◽  
Movement Simulation

This paper introduces the function and basic process of UG movement simulation module UG/Motion, establishment the virtual model and simulation model of Mountain High Altitude Work Vehicle and motion simulation on it, simulation the practice movement of Mountain High Altitude Work Vehicle and obtains motion law and the parameters, and output simulation results through animation and chart. Practice shows that use UG / Motion for motion simulation is an effective aid for mechanical design, and improve work efficiency and perfect the design.

Development on an Acquisition and Analysis System for Indicator Diagram of Piston Engine

2013 ◽  
Vol 475-476 ◽  
pp. 268-272
Author(s):  
Jian Guo Mao ◽  
Han Quan Wang
Keyword(s):  
Data Acquisition System ◽  
Interference Signal ◽  
Cylinder Pressure ◽  
Piston Engine ◽  
Indicator Diagram ◽  
Potential Value ◽  
Hardware Component ◽  
Analysis System ◽  
Engine Development

An acquisition and analysis system for indicator diagram (ID) of piston engine is developed for monitoring the cylinder pressure in engine development. The hardware component of the data acquisition system is introduced. The method of the determination of the TDC, the method of filtering the interference signal of ID and the method of implementation with Visual C++ are presented. The system can provide ID online through the experiment on Honda 125 engine. It can directly and conveniently display the information about combustion. Therefore it has a high potential value in engineering applications.

In-cylinder heat transfer and gas motion of a free-piston diesel engine generator

2017 ◽  
Vol 231 (8) ◽  
pp. 739-752 ◽  
Author(s):  
Chenheng Yuan ◽  
Jing Xu ◽  
Huihua Feng
Keyword(s):  
Heat Transfer ◽  
Gas Flow ◽  
Attractive Alternative ◽  
Piston Engine ◽  
Piston Motion ◽  
Compression Process ◽  
Free Piston ◽  
Reciprocating Engine ◽  
Free Piston Engine ◽  
Significant Difference

The free-piston engine generator is an attractive alternative to the conventional reciprocating engine due to the feature that it moves without crankshaft system. This paper presented a simulation for the investigation on the characteristic of in-cylinder gas motion and heat transfer in a compression ignited free-piston engine generator. An operation experiment was performed to obtain the precise piston motion for the modeling of heat transfer and gas flow. The development of the multi-dimensional model was described, and simulation results were presented and showed good similarity with the experimental data. Then, the heat transfer and gas motion in the free-piston engine generator were discussed, on which the influences of piston motion were also investigated compared with a corresponding conventional reciprocating engine. The results indicated that compared with the conventional reciprocating engine, a higher level of squish and reverse squish effect was found for the free-piston engine generator due to its faster motion around top dead center, while its slower piston motion led to weaker gas turbulence in the compression process. Moreover, the free-piston engine generator and conventional reciprocating engine did not show a significant difference in heat transfer during the compression process, however, an obvious advantage of heat transfer was indicated for the free-piston engine generator in combustion and expansion processes due to its lower combustion temperature and the reduced time that is available for heat transfer caused by its faster expansion. The mechanism for such differences is that the free-piston engine generator moves with uneven equivalent speed.

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