Quantitative measurement of Soot Volume Fraction (SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, La...
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Quantitative measurement of Soot Volume Fraction (SVF) is an essential prerequisite for controlling soot particle emissions from aero-engine combustors. As an in-situ and non-intrusive optical diagnostic technique, Laser-Induced Incandescence (LII) has been increasingly applied for soot concentration quantification in various combustion environments such as laminar flame, vehicle exhaust, internal combustion chamber as well as aero-engine combustor. In this work, we experimentally measured the spatial and temporal distribution of SVF using two-color LII technique at the outlet of a single-sector dual-swirl aero-engine model combustor. The effect of inlet pressure and air preheat temperature on the SVF distribution was separately investigated within a pressure range of 241–425 kPa and a temperature range of 292–500 K. The results show that soot production increases with the inlet pressure but generally decreases with the air preheat temperature. Qualitative analysis was provided to explain the above results of parametric studies. The LII experiments were also conducted under 3 designed conditions to evaluate soot emission under practical operations. Particularly, weak soot emission was detected at the outlet under the idle condition. Our experimental results provide a valuable benchmark for evaluating soot emission in the exhaust plume of this aero-engine combustor during practical operations.
In this study, we address the prevailing gap in food-specific image recognition models by developing an innovative solution using the PyTorch framework and the Predictive REcurrent Neural Network (PReNet). We introduc...
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A mixed-mode forced-convection solar dryer(MMFCSD)is a device that utilizes both direct and indirect solar *** solar col-lector,which stores thermal energy for indirect solar uses,is an essential component of the ***,...
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A mixed-mode forced-convection solar dryer(MMFCSD)is a device that utilizes both direct and indirect solar *** solar col-lector,which stores thermal energy for indirect solar uses,is an essential component of the ***,the thermal effi-ciency of this device is generally *** this study,a technique was employed to improve the heat transfer of the solar collector in a *** technique involved adjusting the air flow pattern into a swirling flow to disturb the thermal boundary layer on the absorber plate under forced convection by using stainless wire *** experiment was conducted under actual conditions and bananas were used as the drying *** experimental results of the thermal efficiency of the solar collector(ƞ_(solar))and the drying efficiency(ƞ_(drying))are *** results indicated that the air outlet temperature andƞsolar of the solar collector with stainless wire mesh were higher than the case without stainless wire mesh,reaching a maximum temperature of 46.22°C and 37.97°C,and average ƞ_(solar) of 0.26±0.02 and 0.14±0.01,*** MMFCSD with stainless wire mesh had a higher ƞ_(drying) than the case without stain-less wire mesh,with values of 0.048±0.004 and 0.039±0.003,respectively,resulting in an~23.07%*** was attributed to the air swirling flow through the stainless wire mesh and the heat accumulation in the drying chamber,which led to an increase in the drying chamber temperature from 54.03°C to 63.60°C,an increase in the effective moisture diffusivity from 7.28×10^(-7) to 1.19×10^(-6) m^(2)/s and a decrease in the drying time of 5 h 30 ***,further research is needed to investigate the quality of the dried sam-ples and their economic value.
The rapid growth of cloud computing is profoundly changing the face of information technology, leading it to new heights of specialization, intelligence, and intensification. Driven by cloud computing, the connections...
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With the increasing requirements for power supply systems and the continuous improvement of emergency rescue command center system construction, the requirements for early warning emergency systems are constantly incr...
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With the widespread application of the Cesium platform, it has been found in project production that the global high-precision computation of Cesium has somewhat hindered the rendering performance of the platform. To ...
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Tyres comprise of both rigid and flexible components. Difficulty in judging the flexibility and material properties makes it one of the more difficult-to-model components in the passenger-vehicle-suspension-tyre-road ...
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The advent of cloud computing has reshaped the landscape of application deployment and management, ushering in an era characterized by unprecedented flexibility, scalability, and agility. In this context, containeriza...
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As a cutting-edge development trend in the field of visualization, cloud rendering technology is currently dominated by game engine manufacturers. Cloud rendering technology based on WebGL engine has not yet been full...
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Solid mixed rare earth catalysts(MREEs)were synthesized by co-precipitation of raw mixed rare earth hydroxide cake obtained from monazite ore processing at different pH values(6,7 and 12).The wavelength dispersive X-r...
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Solid mixed rare earth catalysts(MREEs)were synthesized by co-precipitation of raw mixed rare earth hydroxide cake obtained from monazite ore processing at different pH values(6,7 and 12).The wavelength dispersive X-ray fluorescence spectroscopy(WDXRF)results show that MREEs catalyst coprecipitated at pH 12 contain high contents of active Ce,Nd,La and Y for facilitating both esterification and transesterification *** synthesized MREE by co-precipitated at pH 12 and calcined at300℃possess high amounts of Lewis basic and acidic sites,allowing it to act as bifunctional *** catalyst shows high catalytic activity for the accelerating of the initial reaction rate and converting triglycerides/free fatty acid(FFA)into fatty acid methyl ester(FAME)in both esterification and transesterification *** the reaction conditions of 3 wt%catalyst,20:1 methanol/oil molar ratio,200℃reaction temperature,3.9 MPa reaction pressure and 600 r/min stirring rate,FAME conversion reaches 99.57%in 180 min of reaction time.
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