Numerical research on effect of hydrogen blending fractions on idling performance of an n-butanol ignition engine with hydrogen direct injection

Shang, Zhen; Yu, Xiumin; Shi, Weibo; Huang, Shan; Li, Guanting; Guo, Zezhou; He, Fengshuo

doi:10.1016/j.fuel.2019.116082

Cited by 32 publications

(10 citation statements)

References 61 publications

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“…10 also shows that the BMEP of NGPD mode is all higher than that of NGP mode under each 𝜈 𝑁 and the BMEP can continue to increase with adding hydrogen. The reason is that the mixture concentration distribution inside cylinder formed by combined injection and the favorable combustion characteristics of hydrogen can shorten the total combustion duration and lessen the incomplete combustion, allowing the combustion much closer to ideal constant-volume combustion and more fuel energy can be used for engine working [43]. On the other hand, as shown in fig.…”

Section: Brake Mean Effective Pressurementioning

confidence: 99%

“…From our previous work, the combustion characteristic and emission performance showed great improvement by hydrogen direct injection on a pure gasoline or pure n-butanol SI engine [28,35,42,43,44]. Some aspects such as hybrid approaches, gaseous and particle emissions on an n-butanol blending gasoline engine have also been conducted [45,46].…”

Section: Introductionmentioning

confidence: 99%

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Comparative study on effects of injection mode on combustion and emission characteristics of a combined injection n-butanol/gasoline SI engine with hydrogen direct injection

Shang

Ren

et al. 2020

Energy

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In this paper, on the basis of combined injection technique, three injection modes with five n-butanol/gasoline volume ratios (𝜈 𝑁 ) were put forward, aiming to compare and evaluate the relationship between the injection mode and the combustion and emission characteristics of an n-butanol/gasoline SI engine equipped with an extra hydrogen direct injection system. The results indicated that under low load condition, compared with NGP (n-butanol/gasoline port injection) mode, the NGPD (n-butanol/gasoline combined injection) mode and NGPH (n-butanol/gasoline with hydrogen combined injection) mode can both improve the combustion performance. The peak cylinder pressure of NGPD and NGPH mode was 5.58% and 11.63% higher than that of NGP mode on average, respectively. Furthermore, the combined injection modes concentrated the process of heat release, shortened the combustion duration, increased the power performance and improved the combustion stability at all 𝜈 𝑁 . As for emissions, the NGPD and NGPH combined modes significantly decreased the HC and CO emissions, but increased the NOX emissions. Among all the test conditions, the NGPH mode with 25% 𝜈 𝑁 obtained the best combustion quality. Additionally, the effect rules of 𝜈 𝑁 on combustion and emission characteristics under NGP mode were found to be consistent with those under 2 / 26 NGPD and NGPH combined modes.

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Section: Brake Mean Effective Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study on effects of injection mode on combustion and emission characteristics of a combined injection n-butanol/gasoline SI engine with hydrogen direct injection

Shang

Ren

et al. 2020

Energy

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“…Figure 1 shows the 3D computation model in CONVERGE (V2.3, Convergent Science, Madison, Wisconsin, USA). The grid document is the same as in our former research and was tested for grid independence in [34] to ensure the accuracy and ability of the model to meet the requirements. Table 2 shows mathematical models of our model.…”

Section: Computational Modelmentioning

confidence: 99%

“…In [34], Shang et al studied the effect of hydrogen addition to a hydrogen\n-butanol SI engine. With more hydrogen addition, HC, CO, acetaldehyde and formaldehyde emissions were all reduced continually.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Second Injection Timing on the Engine Performances of a Gasoline/Hydrogen SI Engine with Split Hydrogen Direct Injecting

Sun

et al. 2020

Energies

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Split hydrogen direct injection (SHDI) has been proved capable of better efficiency and fewer emissions. Therefore, to investigate SHDI deeply, a numerical study on the effect of second injection timing was presented at a gasoline/hydrogen spark ignition (SI) engine with SHDI. With an excess air ratio of 1.5, five different second injection timings achieved five kinds of hydrogen mixture distribution (HMD), which was the main factor affecting the engine performances. With SHDI, since the HMD is manageable, the engine can achieve better efficiency and fewer emissions. When the second injection timing was 105° crank angle (CA) before top dead center (BTDC), the Pmax was the highest and the position of the Pmax was the earliest. Compared with the single hydrogen direct injection (HDI), the NOX, CO and HC emissions with SHDI were reduced by 20%, 40% and 72% respectively.

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“…Their experimental results showed that hydrogen addition could heighten the brake thermal efficiency and the lean burn limit and decrease the ignition delay, rapid combustion duration and CO and HC emissions. Shang et al [ 31 ] simulated and analyzed the idling performance of four hydrogen fractions on an n-butanol SI engine with directly injected hydrogen. The simulation results showed that the hydrogen addition could increase the peak cylinder pressure, accelerate and concentrate the heat release process, reduce HC, CO and acetaldehyde emissions and improve the idle combustion performance of butanol engines.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Combustion and Cycle-by-Cycle Variations of an N-Butanol Engine with Hydrogen Direct Injection under Lean Burn Conditions

Shang

Shi

et al. 2022

Sensors

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This study experimentally investigated the effects of hydrogen direct injection on combustion and the cycle-by-cycle variations in a spark ignition n-butanol engine under lean burn conditions. For this purpose, a spark ignition engine installed with a hydrogen and n-butanol dual fuel injection system was specially developed. Experiments were conducted at four excess air ratios, four hydrogen fractions(φ(𝐻2)) and pure n-butanol. Engine speed and intake manifold absolute pressure (MAP) were kept at 1500 r/min and 43 kPa, respectively. The results indicate that the θ0–10 and θ10–90 decreased gradually with the increase in hydrogen fraction. Additionally, the indicated mean effective pressure (IMEP), the peak cylinder pressure (Pmax) and the maximum rate of pressure rise ((dP/dφ)max) increased gradually, while their cycle-by-cycle variations decreased with the increase in hydrogen fraction. In addition, the correlation between the (dP/dφ)max and its corresponding crank angle became weak with the increase in the excess air coefficient (λ), which tends to be strongly correlated with the increase in hydrogen fraction. The coefficient of variation of the Pmax and the IMEP increased with the increase in λ, while they decreased obviously after blending in the hydrogen under lean burn conditions. Furthermore, when λ was 1.0, a 5% hydrogen fraction improved the cycle-by-cycle variations most significantly. While a larger hydrogen fraction is needed to achieve the excellent combustion characteristics under lean burn conditions, hydrogen direct injection can promote combustion process and is beneficial for enhancing stable combustion and reducing the cycle-by-cycle variations.

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Numerical research on effect of hydrogen blending fractions on idling performance of an n-butanol ignition engine with hydrogen direct injection

Cited by 32 publications

References 61 publications

Comparative study on effects of injection mode on combustion and emission characteristics of a combined injection n-butanol/gasoline SI engine with hydrogen direct injection

Comparative study on effects of injection mode on combustion and emission characteristics of a combined injection n-butanol/gasoline SI engine with hydrogen direct injection

Study on the Effect of Second Injection Timing on the Engine Performances of a Gasoline/Hydrogen SI Engine with Split Hydrogen Direct Injecting

An Experimental Study on Combustion and Cycle-by-Cycle Variations of an N-Butanol Engine with Hydrogen Direct Injection under Lean Burn Conditions

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