Compressors are important components in various power systems the field of energy and power. In practical applications, compressors often operate under non-design conditions. Therefore, accurate calculation on performance operating conditions is great significance for development application certain equipped with compressors. To calculate predict a compressor all through limited data, interpolation method was combined support vector machine (SVM). Based known data points design conditions,...

Abstract The combustion performance of a compression ignition (CI) four-stroke aviation engine fueled with pure kerosene No. 3 rocket propellant (RP-3) was experimentally investigated for comparison diesel. Pilot injection and main RP-3 diesel were unified under same test conditions. results show that when burning RP-3, the maximum power is 1% lower than diesel, specific fuel consumption (SFC) effective thermal efficiency (ETE). durations small differences less 0.4 °CA heavy loads, while...

Abstract Due to safety and convenience, aviation heavy fuel (AHF) is quite suitable for use as an energy source in piston engines small aerial drones, although its atomization important issue. The purpose of this article present the mechanism AHF during low-pressure direct injection (LPDI) results investigation mixing process flow state fuel–air two-phase flows. In study, experimental data were obtained parameters spray, which verified improved calculation model LPDI that considered primary...

The application of direct injection (DI) technology can effectively improve the atomization effect heavy fuel to reduce loss engines (HFE). spray characteristics directly affect combustion performance engine. To investigate process and evaporation in-cylinder for an air-assisted (AADI) engine, a simulation calculation model AADI HFE was established with use computational fluid dynamics tool. injector one-dimensional were verified by test data. influences timing pressure on mixture formation...

Purpose The purpose of this paper is to investigate power performance, economy and hydrocarbons (HC)/carbon monoxide (CO) emissions diesel fuel on a two-stoke direct injection (DI) spark ignition (SI) engine. Design/methodology/approach Experimental study was carried out two-stroke SI diesel-fuelled engine with air-assisted injection, whose performance HC/CO characteristics under low-load conditions were analysed according the effects energy, advance angle (IAA), timing excess-air-ratio....

Abstract The aviation kerosene piston engine (AKPE) is the main power system for small- and medium-sized unmanned aerial vehicles (UAVs). Conventional AKPEs use carburetors or port fuel injection (PFI) as supply, resulting in poor cold start performance difficulty forming an economically efficient stratified mixture. In addition, two-stroke using PFI have serious scavenging losses. These reasons lead to economic of conventional AKPEs. Direct (DI) can be controlled through precise timing form...

A high-energy multispark ignition system with a single discharge capacitor was designed and developed. The verified to be capable of releasing high energy. cold start partial-load test at 6 °C ambient temperature were conducted on two-stroke spark heavy fuel engine air-assisted direct injection. results showed that compared the original magnetoignition system, applying 5-times approach new is able successfully solve problem engine. Under condition, increasing number ignitions enhances...

As a miniaturized direct injection (DI) solution, the pump injector is of great significance for small aviation piston engines, such as two-stroke heavy-fuel engines. The accurate control timing and amount injections an important application prerequisite. In this paper, flow characteristics with different driving circuits parameters are investigated. effects power supply freewheeling on opening closing delays theoretically studied. A schematic self-designed logic circuit proposed, it...

To overcome the difficulty of cold start a spark-ignition (SI) engine fueled with aviation kerosene, series experimental investigations were carried out on port fuel injection (PFI) two-stroke engine. First, effects several auxiliary preheating methods, including kerosene preheating, intake manifold crankcase and cylinder head studied. Then, based physical chemical properties fuel, an optimized ignition control strategy was proposed. The results showed that cannot ensure successful start....

As a miniaturized direct-injection (DI) solution, self-pressurized injector is of great significance for small aviation piston engines, such as the spark-ignited two-stroke heavy-fuel engines. Accurate control timing and amount injections an important application prerequisite. In this paper, high-speed camera employed to study spray characteristics, injection delay fuel duration under three drive modes in constant-volume bomb environment. The results show that 8-A constant-current mode...

To effectively enhance the thermal security of Li-ion battery packs used in electric vehicle industry, novel cooling systems equipped with serpentine channels are established. Then, heat generation model is established and verified experimentally. In this research study, structure channel, coolant velocity, temperature, flow direction considered to be influencing factors. The results demonstrate that, by adopting a better conductivity can obtained, type-B system possesses more reasonable...

Abstract When using point cloud to detect indoor objects, the collected often has a lot of noise, such as points that are too far away, background have nothing do with objects be detected, which will bad impact on detection. In order solve these problems, method is proposed preprocess original before training and prediction. First, away should eliminated. Second, table eliminated much possible. Then, coordinate conversion required for cloud. Finally, VoteNet used train processed clouds...