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,...

Purpose The purpose of this paper is to compare the combustion characteristics, including pressure, heat release rate (HRR), coefficient variation (COV) indicated mean effective pressure (IMEP), flame development period and duration, aviation kerosene fuel, namely, rocket propellant 3 (RP-3), gasoline on a two-stoke spark ignition engine. Design/methodology/approach This an experimental investigation using bench test reflect performance two-stroke unmanned aerial vehicle (UAV) engine RP-3...

The following control problem is a challenging issue in vehicle adaptive cruise control. In the process, multiple objectives need to be considered while ensuring safety. To comprehensively study and evaluate algorithms, this paper establishes model, energy consumption model. After verifying accuracy of models, corresponding proportion-integral-derivative (PID), model predictive (MPC), dynamic programing (ADP) algorithms are proposed based on models. three integrated into using Simulink, real...

Purpose The purpose of this paper is to investigate the knock combustion characteristics, including pressure, heat release rate (HRR) and intensity aviation kerosene fuel, that is, Rocket Propellant 3 (RP-3), on a port-injected two-stoke spark ignition (SI) engine. Design/methodology/approach Experimental investigation using bench test statistical analysis data reflect characteristics two-stroke SI unmanned aerial vehicle (UAV) engine RP-3 fuel. Findings Under full load condition 4,000 rpm,...

The use of exhaust gas recirculation, complex after-treatment systems, advanced technology high-strength engines, and underwater will lead to increased diesel back pressure (EBP). This increase the residual exchange temperature in cylinder reduce fresh air charged next cycle. In this work, effects two high EBP conditions (10 kPa 25 kPa) on performance medium-speed ship engines under different loads are explored through experiments. results show that from 10 has little effect heat release...

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...

To study the influence of injection time and volume on working process a two-stroke kerosene direct engine, an experimental was carried out improved inline three-cylinder gasoline combined with calculations analysis GT-POWER AVL FIRE software. The results showed that when end angle increased from 50° to 70° before top dead center (BTDC), average pressure temperature in cylinder rapidly, peak value cumulative heat release increased, combustion more sufficient. fuel set 7.5 mg, 8 8.5 mg. With...

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...

To investigate the fuel flow control for starting a crankcase-injected two-stroke spark ignition (SI) engine that is fueled with rocket propellant 3 (RP-3), film compensation model crankcase injection was presented on basis of theory. A discrete algorithm also given in this study. According to compensation, process simulated. The simulation results showed compensator could ensure sufficient kerosene enters cylinder. Starting experiments SI RP-3 were carried out cylinder temperature preheated...

Two-stroke spark ignition (SI) unmanned aerial vehicle (UAV) engines do not allow heavy knock and require a certain safety margin. However, weak can help the engine increase power output reduce fuel consumption. To accurately extract characteristics of vibration signals under condition knock, signal feature extraction method based on Mallat decomposition algorithm was proposed. decompose into two parts: low-frequency high-frequency noise signal. The decomposed is eliminated, retained as...

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...

Abstract The two-stroke spark ignition (SI) kerosene piston engines (KPE) are commonly utilized in lightweight unmanned aerial vehicles (UAV). quality of mixture formation is crucial for the engine performance. This paper investigates a semi-direct injection (SDI) SI KPE. Computational models were established using 1D simulation tool and 3D computational platform to analyze effects pressure, timing, fuel temperature on atomization formation. results indicate that increasing pressure promotes...