Lean combustion of stratified hydrogen in a constant volume chamber

The effect of EGR and hydrogen addition to natural gas on performance and exhaust emissions in a diesel engine by AVL fire multi-domain simulation, GPR model, and multi-objective genetic algorithm

“…As can be seen due to the variation of hydrogen content in HCNG fuel, the increase of EGR ratio leads to the decrease of CHR, while when the EGR ratio reaches 15%, the CHR start to an increase due to increase of heat transfer in engine and cylinder wall. Meanwhile increase of hydrogen in HCNG blend more than 30% lead to decrease of combustion duration and finally decrease of the engine efficiency [61,62].…”

Effect of injection and ignition timing on a hydrogen-lean stratified charge combustion engine

“…32 Moreover, the miss-fire phenomenon was measured in a constant-volume chamber at an elevated in-chamber pressure due to spray collapse. 37 Stable hydrogen SCC can be realized by optimizing the injection timing; however, the worst efficiency was measured in the case of stable engine operation. To analyze the hydrogen SCC in detail, Figure 6 shows the HRR result for 300 cycles and the average HRR.…”

The role of hydrogen for future internal combustion engines

“…The investigation of a high-pressure hydrogen jet is required by means of both experimental optical diagnostics and numerical CFD modelling. Some preliminary research on the evolution of a hollow-cone-shaped hydrogen jet is described in Lee et al 50,51 and Roy et al 52 The formation of hydrogen mixture fraction by laser-induced breakdown spectroscopy is described in Roy et al 52 It was observed that hydrogen rich-combustion emits a visible range of wavelengths, as shown in Lee et al, 51 Shudo and Oba 53 and Schefer et al 54 and presented in Figure 4.…”

“…Direct flame images and flame division converted images at different mixture formation times. Figure adapted from Lee et al51…”