Troels Dyhr Pedersen.indd - Solid Mechanics

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8.1.1 Engine setup 22
8.1.2 Modifications 22
8.1.3 Piston modifications 24
8.2 Cylinder pressure transducers 25
8.3 Data acquisition 25
9 HEAT RELEASE CALCULATIONS 27
9.1 The Heat Release analysis 27
9.2 Location of TDC 27
9.3 Specific heat ratio 29
9.4 Temperature estimate 31
9.5 Heat losses 31
10 THE REACTION KINETICS OF DME 33
10.1 Elementary reaction model 33
10.2 The detailed reaction scheme 33
10.3 Reducing the mechanism for lean combustion 33
10.4 Comparison of the full and the reduced schemes 36
10.5 Reaction paths 37
10.5.1 Initiation and low temperature reaction paths 37
10.5.2 High temperature reactions 41
10.6 Manipulating low temperature reactions 42
10.6.1 Effect of methanol on low temperature reactions 42
10.6.2 Effect of EGR 43
10.7 List of species 44
11 ENGINE ACOUSTICS 45
11.1 Measurements 45
11.2 Choice of sampling frequency 45
11.3 Equipment 46
11.4 Handling the confined space acoustic issues 46
11.5 Post sample digital filtering 47
11.5.1 Filter methodology 47
11.5.2 Filtering of pressure data for heat release analysis 47