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In-Cylinder Pressure and Flame Measurement. Dr. Manoochehr Rashidi Engine Research Center Shiraz University. http://succ.shirazu.ac.ir/~motor/ [email protected] Prepared for the 3 rd conference on IC engines, Tehran 2004.

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In cylinder pressure and flame measurement

In-Cylinder Pressure and Flame Measurement

Dr. Manoochehr Rashidi

Engine Research Center

Shiraz University

http://succ.shirazu.ac.ir/~motor/

[email protected]

Prepared for the 3rd conference on IC engines, Tehran 2004


Modern engine design, development and operation, involvesmany aspects of science, technology, and engineering. Engine testing is an important aspect of internal combustion engines, as it leads to a better understanding of engine operation and performance.

The use of computer control and data acquisition systems has been complemented by increasing levels of engine instrumentation. This leads to large quantities of data, and a need for effective post processing and systematic analysis of data. Increasing use of powerful computers, leads to greater optimization prior to the start of development testing. These factors are balanced by increasing restrictions on engine emissions, and difficulty of reducing engine specific fuel consumption.

Another useful in-cylinder measurement is the flame propagation, flame velocity and burn rate, which is achieved with use of high speed photography. This type of results will be useful as an input to simulating engine performance and cycle analysis.


This presentation is a review of equipment and procedures, necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.

Typical results showing variation of pressure, burn rare, heat release rate, and burning velocity, with crank angle; also flame photographs, are included.


Mechanical low speed method for in cylinder pressure measurement
Mechanical, low speed method for necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.in-cylinder pressure measurement


Simple electronic method using oscilloscope
Simple electronic method, using oscilloscope necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Typical pressure measurement system
Typical pressure measurement system necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Quartz piezoelectric pressure transducer
Quartz Piezoelectric pressure transducer necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Quartz piezoelectric pressure transducer1
Quartz Piezoelectric pressure transducer necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Quartz piezoelectric pressure transducer2
Quartz Piezoelectric pressure transducer necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Charge amplifier
Charge Amplifier necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


Crank angle encoder and pressure generator calibrator necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.


High speed analog digital converter necessary for in-cylinder pressure measurement and analysis, using data acquisition equipment. Procedure and equipment for measuring pressure and flame velocity, simultaneously, are also described.

data acquisition PCI board

Available for Compact PCI/PXI

4 single-ended simultaneous sample/hold A/D channels

14-bit resolution,

500 kS/s sampling rate

Gains: 1, 2, 5, 10

Two 12-bit analog outputs;

32 digital I/O lines;

three 16-bit counter/timers

Stream-to-disk capability

Calibration certificate

Software for Windows

Simultaneous operation

of all sub systems


Pressure recorded every ½ degree, for direct injection diesel engine, 1000 rpm 60% load. (d) is the derivative of (a). (b) is derivative with smoothing applied twice. (c) is derivative after smoothing trace (a) twice.


Taylor series algorithm used for smoothing data
Taylor series algorithm used for smoothing data diesel engine, 1000 rpm 60% load. (d) is the derivative of (a). (b) is derivative with smoothing applied twice. (c) is derivative after smoothing trace (a) twice.


Equation for calculating fuel heat release rate from pressure data
Equation for calculating diesel engine, 1000 rpm 60% load. (d) is the derivative of (a). (b) is derivative with smoothing applied twice. (c) is derivative after smoothing trace (a) twice.fuel heat release ratefrom pressure data


Variation of cylinder pressure and inlet pressure at engine diesel engine, 1000 rpm 60% load. (d) is the derivative of (a). (b) is derivative with smoothing applied twice. (c) is derivative after smoothing trace (a) twice.part load for one cycle. The valve timing is also shown


Effect of combustion chamber design on rate of pressure rise, combustion duration, and octane requirement.


Pressure in the intake and exhaust manifold of four cylinder Si engine. p1 is located in intake 150 mm from cylinder. p2 is located in exhaust 200 mm from cylinder. p3 is located in exhaust 700 mm from cylinder. IO and EO are inlet and exhaust open.


Pressure diagram showing normal combustion a slight knock b and intense knock c
Pressure diagram showing normal combustion (a), Si engine. p1 is located in intake 150 mm from cylinder. p2 is located in exhaust 200 mm from cylinder. p3 is located in exhaust 700 mm from cylinder. IO and EO are inlet and exhaust open.slight knock (b), and intense knock (c).


Simultaneous measured pressure at two locations in engine with combustion knock
Simultaneous measured pressure at two locations Si engine. p1 is located in intake 150 mm from cylinder. p2 is located in exhaust 200 mm from cylinder. p3 is located in exhaust 700 mm from cylinder. IO and EO are inlet and exhaust open.in engine with combustion knock.


Pressure and Si engine. p1 is located in intake 150 mm from cylinder. p2 is located in exhaust 200 mm from cylinder. p3 is located in exhaust 700 mm from cylinder. IO and EO are inlet and exhaust open.

Rate of

Heat release

Diagram

Showing

Cycle by cycle

Variation


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