Effects of supersonic nozzle guide vanes on the performance and flow structures of a rotating detonation combustor

Shen, Dawen; Cheng, Miao; Wu, Kevin; Sheng, Zhaohua; Wang, Jianping

doi:10.1016/j.actaastro.2022.01.002

Cited by 68 publications

(9 citation statements)

References 37 publications

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“…Figure 11 illustrates the residual plots for mean. The graph demonstrates that the total number of experiments falls within the normal range of percentage probability (Ahmad et al, 2023;Iftikhar et al, 2023;Shen et al, 2022). As a result, it is possible to create an appropriate regression equation that will offer a highly accurate and precise prediction of the Q i from the chosen combinations of the control factors.…”

Section: Resultsmentioning

confidence: 90%

Developing a model for waste plastic biofuels in CRDi diesel engines using FTIR, GCMS, and WASPAS synchronisations for engine analysis

Kanchan,

Pradhan,

Kumar

et al. 2023

Energy Exploration & Exploitation

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The excessive use of single-use plastic products in modern life has caused severe environmental, social, economic, and health consequences globally. Mostly all plastics manufactured are one-time-use materials that end up in landfills or as unmanageable garbage. This situation has led to the production of around 400 million tonnes of plastic waste per year, and if this trend continues, global production will reach up to 1100 million tonnes by 2050. India alone produced over 34.7 lakh tonnes per annum (TPA) of plastic waste, with only half of it being recycled or co-processed. As such, there is an urgent need to develop ways to reduce plastic waste. One possible solution is the use of waste plastic biofuel in engines, which has been shown to have promising results. The study aimed to analyse waste plastic oil using (Gas Chromatography Mass Spectrometry) GC-MS and (Fourier Transform Infrared Spectroscopy) FTIR analysis to identify its chemical composition. The findings of the study revealed the presence of various chemical compounds, such as alcohol, hydroperoxide, carbonyl acid groups, ester, carboxylic acid, ketones, aldehyde groups, and others. FTIR analysis confirmed the presence of alcohol, hydroperoxide, carbonyl acid groups, methyl and methylene groups, ester, carboxylic acid, ketones, aldehyde group, symmetric and asymmetric C-H bending, C-O stretch for ethers, carboxylic acids, and esters, and=C-H bending out for alkenes. The study further explains that primary plastic consumption and packaging lifetime have a significant impact on plastic waste generation. The research indicates the need to explore alternative ways to recycle and dispose of single-use plastics to mitigate its negative impact on the environment. Furthermore, this study analyses the statistical optimisation method to develop a model fit for engine behaviour using waste plastic biofuel on a single-cylinder (common rail direct injection engine) CRDi diesel engine using the (weighted aggregated sum product assessment) WASPAS approach. Additionally, the objective is to develop a model that can optimise the engine's performance while using waste plastic biofuel. The uncertainty analysis demonstrated that the experiment was carried out with a high degree of accuracy and the results were reliable. The study employed the WASPAS methodology to evaluate the performance of different (waste plastic oil) WPO samples, and the results showed that the optimal parametric setting to obtain the desired responses can be achieved with a fuel blend of 5%, load of 21 bar, and speed of 2000 RPM. However, the results demonstrate that the use of waste plastic biofuel can significantly improve engine performance, and the proposed optimisation model can accurately predict the engine's behaviour. The regression equation that was formulated showed a reasonable degree of agreement between the actual experimental results and the predicted values, thereby indicating the reliability of the experiment. Significant effects were observed from fuel blend, and speed, whereas load did not make a substantial contribution. The findings regarding the effect of parameters suggest that a reduction in fuel blend, and engine speed resulted in a decline in the performance index, while variations in load had little impact. The relationship between load and speed demonstrates that a rise in load and a reduction in speed contributed to enhanced combustion and a higher performance index. The interaction among fuel blend and speed, with a particular emphasis on the significance of reduced fuel blend and speed values in order to optimise the performance index. The findings of the analysis underlined the vitality of process parameters, specifically fuel blend and speed, wherein speed exhibited a significant impact on the outcomes. The study concludes that the use of waste plastic biofuel in engines can be an effective way to reduce plastic waste while improving engine performance. This study's findings can be applied to various engines to improve their performance while reducing plastic waste. All in all, the outcomes of the study make a substantial contribution to the advancement of scientific information regarding the properties of waste plastic oil as well as its combustion characteristics. This expands the potential for advanced breakthrough innovations in sustainable energy solutions and the conservation of the environment.

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Section: Resultsmentioning

confidence: 90%

Developing a model for waste plastic biofuels in CRDi diesel engines using FTIR, GCMS, and WASPAS synchronisations for engine analysis

Kanchan,

Pradhan,

Kumar

et al. 2023

Energy Exploration & Exploitation

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“…In addition, the reflected shock wave B interacts with the pressure surface of the S n stator blade to form pressure wave C, which propagates to P1 at 1715.4 µs to form the fourth pressure peak. According to Shen and colleagues, 35,44 the pressure contour plot in Figure 7B for the forward propagation of the rotating detonation wave defines the relative position of the wave and turbine blades as "aligned," while the relative position relationship is "misaligned" when the detonation wave propagates in the reverse direction.…”

Section: Interactions Between Rotating Detonation Wave Complex and Pl...mentioning

confidence: 99%

“…It was found that the gas compression from the detonation and reflected wave lead to a sharp increase in the blade wall temperature, while the oblique excitation wave changes the trajectory of the airflow, which results in deviations in the airflow direction from the incident. Shen et al 35 numerically studied a rotating blast combustion chamber with three supersonic guide vane structures and compared it with a benchmark operating condition without a nozzle guide vane. They found that the aligned structures have the best‐combined performance of nonconstant damping, flow regulation, total pressure gain, and useful work production.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the interactions between rotating detonation wave complex and planar turbine cascade

Xia

et al. 2022

Energy Science & Engineering

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Due to pressure gain characteristics, the rotating detonation combustor (RDC) can be integrated into gas turbines by further improving the system's performance. The matching of unsteady flows in the RDC and turbine is a key challenge. Here, interactions in an RDC and planar turbine cascade are investigated using the unsteady Reynolds time-averaged Navier-Stokes method. The effects of the blade profiles on interactions between the oblique shock wave (OSW) and turbine cascade are analyzed, and the suppression effect of the turbine cascade on high-frequency pressure oscillations is evaluated. The results show that the OSW interacts with the leading edge, pressure side, suction side, and trailing edge of the turbine stator and rotor blades, which generates complex wave systems in the cascade passage. The opposite propagation direction causes the OSW to be aligned or misaligned with the stator blade. The position of the OSW that operates on the turbine cascade changes, and two different wave system structures appear. The various pitches of the turbine cascade at different blade heights cause differing intensities and propagation directions in the reflected wave as generated by the action of the OSW and turbine cascade and the variable flow fields at different blade heights. The turbine cascade can significantly suppress the high-frequency pressure oscillations, while the pressure amplitude attenuation rate can reach over 80% when the OSW propagates through the turbine cascade. These findings expound on the interaction mechanism between the rotating detonation wave complex and the turbine stator and rotor blades.

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“…These vortices develop due to the shear between the high-velocity cross jet and the surrounding air. Vortex roll-up enhances fuel–air mixing by entraining and stretching the fuel plume, facilitating better fuel dispersion and interaction with the cross-flowing air 30 , 31 .…”

Section: Introductionmentioning

confidence: 99%

Using shock generator for the fuel mixing of the extruded single 4-lobe nozzle at supersonic combustion chamber

Alizadeh,

Jasim,

Sohrabi

et al. 2024

Sci Rep

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The importance of the fuel injection configuration on the propulsion efficiency of high-speed vehicles is apparent. In this article, the use of an annular extruded 4-lobe nozzle for the injection of fuel jet in a supersonic combustor of a scramjet engine in the existence of a shock generator is examined. The main aim of this study is to obtain the efficient jet arrangement for efficient fuel mixing inside the engine of hypersonic vehicles. A numerical approach is used to model the supersonic air stream and cross-jet flow with the SST turbulence model. The role of nozzle altitude and internal air jet on the fuel mixing of the hydrogen within the high-speed domain are disclosed. The importance of the horseshoe vortex and counter-rotating vortex on the fuel distribution is also presented. Our results show that the usage of a coaxial jet instead of an annular jet would increase fuel mixing by more than 40% in the combustion chamber.

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Effects of supersonic nozzle guide vanes on the performance and flow structures of a rotating detonation combustor

Cited by 68 publications

References 37 publications

Developing a model for waste plastic biofuels in CRDi diesel engines using FTIR, GCMS, and WASPAS synchronisations for engine analysis

Developing a model for waste plastic biofuels in CRDi diesel engines using FTIR, GCMS, and WASPAS synchronisations for engine analysis

Numerical investigation on the interactions between rotating detonation wave complex and planar turbine cascade

Using shock generator for the fuel mixing of the extruded single 4-lobe nozzle at supersonic combustion chamber

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