scholarly journals Crank Angle Resolved HC-Detection Using LIF in the Exhausts of Small Two-Stroke Engines Running at High Engine Speed

1996 ◽  
Author(s):  
Öivind Andersson ◽  
Greger Juhlin ◽  
Martin Ekenberg ◽  
Bengt Johansson ◽  
Marcus Aldén
Keyword(s):  
Engine Speed ◽  
Crank Angle ◽  
High Engine Speed

Combustion performance investigation of aviation kerosene (RP-3) on a compression ignition diesel engine under various loads

2021 ◽  
pp. 1-22
Author(s):  
Rui Liu ◽  
Kaisheng Huang ◽  
Yuan Qiao ◽  
Zhenyu Wang ◽  
Haocheng Ji
Keyword(s):  
Engine Speed ◽  
Pilot Injection ◽  
Compression Ignition ◽  
Combustion Performance ◽  
Combustion Duration ◽  
Peak Heat Release Rate ◽  
Crank Angle ◽  
Main Injection ◽  
High Engine Speed ◽  
Heavy Loads

Abstract The combustion performance of a compression ignition (CI) four-stroke aviation engine fueled with pure No. 3 rocket propellant (RP-3) was experimentally investigated for comparison with diesel. Pilot injection and main injection for RP-3 and diesel were unified under same test conditions. The results show that when burning RP-3, the maximum power of engine is 1% lower than that of burning diesel, with lower specific fuel consumption (SFC) and effective thermal efficiency (ETE). The combustion durations of RP-3 and diesel show small differences of less than 0.4°CA under heavy loads, while the combustion duration of RP-3 is shorter than that of diesel under low loads. The crank angle at 50% mass fraction burnt (CA50) of RP-3 shows differences of 0.3-1°CA compared to that of diesel. For pilot injection at a high engine speed, the ignition delay angle (IDA) of RP-3 is basically equal to that of diesel. With decreasing engine speed, the maximum difference of 1.2°CA in IDAs exist under medium or small loads. For the main injection, the IDA of RP-3 is lager than diesel under heavy loads at various engine speeds. As the load decreases, the IDA of RP-3 is extended. The peak heat release rate (HRR) of RP-3 during main injection combustion is basically the same as diesel under heavy loads, while the intervention effect of unburnt pilot-injected RP-3 under low loads results in a higher peak HRR.

A Research on Engine Phase and Speed Estimation Method Based on Cylinder Pressure Sensor

2013 ◽  
Author(s):  
Jinli Wang ◽  
Fuyuan Yang ◽  
Minggao Ouyang ◽  
Ying Huang
Keyword(s):  
Pressure Sensor ◽  
Engine Speed ◽  
Combustion Engine ◽  
Pressure Sensors ◽  
Estimation Method ◽  
Speed Estimation ◽  
Cylinder Pressure ◽  
State Control ◽  
Experimental Proof ◽  
Crank Angle

Cylinder pressure based combustion state control is a direction that has drawn much attention in the field of internal combustion engine control, especially in the field of diesel HCCI (Homogeneous Charge Compression Ignition) research. In-cylinder pressure sensors have the potential to diagnose or even replace many traditional sensors, including camshaft and crankshaft sensors. This paper did research on engine synchronization method based on in-cylinder pressure signal. The research was based on a 4-cylinder high pressure common rail diesel engine equipped with 4 PSG (Pressure Sensor Glow Plug) type piezo-resistance cylinder pressure sensors, intended for HCCI research. Through theoretical analysis and experimental proof, methods and models for cylinder identification, engine phase estimation and engine speed estimation are given and further verified by experiments. Results show that cylinder pressure sensor could be used to identify cylinder instead of cam shaft sensor. The models for engine phase and speed estimation have been proved to have precision of 3° crank angle and 4.6rpm, respectively. The precision of engine phase and speed estimation provides a possibility for the engine to run if the crankshaft sensor fails, but more researches have to be carried out with respect to crankshaft sensor replacement.

Effects of Design for Piston Pin and Bearing on State of Bearing Lubrication

2007 ◽  
Author(s):  
Hideyuki Iwasaki ◽  
Yuuto Higasa ◽  
Masaaki Takiguchi ◽  
Seiichi Sue ◽  
Keitaro Shishido
Keyword(s):  
Contact Pressure ◽  
Engine Speed ◽  
Gasoline Engine ◽  
The State ◽  
Bearing Contact ◽  
High Engine Speed

We measured the friction of piston pin boss bearings for a gasoline engine to make sure of the state of lubrication. In addition, we checked how the shape of the piston pin as well as that of the pin boss influenced the state of bearing lubrication, which was analyzed according to the FEM calculations of pin and bearing contact pressure. As a result, it was made clear that the state of bearing lubrication sharply deteriorated at an engine speed of 3500 rpm or higher because the deformed pin caused the pin edge to heavily come into contact with the bearing, and a side relief was able to improve the state of lubrication at a high engine speed. We also gave a check to the piston pin for thickness to see how it influenced the state of lubrication, finding that a lighter-weight pin led to the deterioration of lubrication.

scholarly journals Analisis Kekasaran Baja AISI 304 Akibat Variasi Parameter pada Proses Roughing CNC Turning Menggunakan Pahat Cermet

2020 ◽  
Vol 3 (1) ◽  
pp. 18
Author(s):  
Nugroho Setyo Pambudi
Keyword(s):  
Surface Roughness ◽  
Engine Speed ◽  
Descriptive Analysis ◽  
Feed Speed ◽  
Aisi 304 ◽  
Analysis Techniques ◽  
Spindle Rotation ◽  
High Engine Speed ◽  
High Feed ◽  
Data Collection Technique

Abstract: This study aims to determine the surface roughness value of AISI 304 steel due to variations in spindle speed and feed motion. The method used is pre-experimental design and data analysis techniques used are descriptive analysis techniques. The spindle rotation speed used is 1990 rpm, 2100 rpm, and 2300 rpm, while the feed motion used is 0.18 mm / rev, 0.23 mm / rev, and 0.28 mm / rev. The cutting tool used in this study is a Mitsubishi brand insert chisel with ISO standard CNMNG120404-MA, while the data collection technique using a measuring tool to measure the surface roughness of the workpiece is the Surface Roughness Test Mitutoyo Portable Surftest SJ 301 series. The results of this study indicate that high engine speed reaches 2300 Rpm and low feed motion reaches 0.18 mm / rev resulting in low surface roughness levels reaching 2.17 µm. While the highest is obtained at low engine speed and high feed motion which reaches 1900 Rpm and 0.28 mm / rev with a surface roughness value of 4.43 µm.Keywords: Spindle rotation, feed speed, turning, CNC lathe, surface roughness. 

Crank-Angle Resolved In-Cylinder Friction Measurements With the Instantaneous IMEP Method

2005 ◽  
Author(s):  
M. E. Leustek ◽  
C. Sethu ◽  
S. Bohac ◽  
Z. Filipi ◽  
D. Assanis
Keyword(s):  
Engine Speed ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Design Parameters ◽  
Connecting Rod ◽  
Pressure Transducers ◽  
Crank Angle ◽  
Friction Measurements ◽  
Force Calibration ◽  
Speed Fluctuations

The instantaneous IMEP method is used to measure crank-angle resolved in-cylinder friction force in a series production spark ignition engine as a function of design parameters and operating conditions. An improved telemetry system, which continues to provide data after 50+ hours of operation at speeds as high as 2000 rpm, is presented. Primary sources of error associated with the technique will be presented. These include intra-cycle engine speed fluctuations, the effect of thermal shock on pressure transducers, the effect of connecting rod force calibration and measurement error. The instantaneous IMEP method is used to measure crank-angle resolved in-cylinder engine friction as functions of engine speed and coolant (oil-film) temperature. Both crank-angle resolved and cycle-integrated results are compared.

An Empirical Investigation of Biodiesel Engine Fuelled with Palm Oil Methyl Ester Biodiesel Blends

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Abhishek Samanta ◽  
Prokash C. Roy
Keyword(s):  
Methyl Ester ◽  
Palm Oil ◽  
Engine Speed ◽  
Load Condition ◽  
Connecting Rod ◽  
Engine Model ◽  
Engine Cylinder ◽  
Crank Angle ◽  
Predicted Model ◽  
Performance Results

Compression ignition, single zone biodiesel engine model has been established based on engine geometries (stroke, cylinder diameter, connecting rod length and diameter of crank). Deviation in specific heat ratio of engine cylinder charge and burned gases has been established to anticipate the pressure fluctuation relative to the crank angle, engine output and mean effective pressure relevant for Palm Oil Methyl Ester (POME) biodiesel. Predicted model for biodiesel engine has been verified using diesel and POME blended biodiesel (B5 and B10). In order to find out the performance results and combustion nature, constant engine speed (1500 rpm) is maintained during the experiments under 0%, 25%, 50% and 100% loading. It has been observed that when the experimental engine setup was fuelled with POME B10, the performance is depleted for loading other than 50% to 75% load condition and combustion aspect of B5 and B10 POME is slightly changed in comparison with diesel.

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