Integrating engine performance and trajectory analysis in designing future Shuttle systems

A method to predict gas turbine component life based on analysis of engine performance is presented. Engine performance history is obtained from in-flight monitored engine parameters and flight conditions and downloaded for processing by a tool integrating a number of software tools and models. These subsequently include a comprehensive thermodynamical engine system model, heat transfer, thermal and mechanical load models, and finally, a life consumption model. Thermal and mechanical load distributions in the component as well as component life can be predicted. At this stage, the overall life prediction inaccuracy of the tool is dominated by the relatively high inaccuracy of the lifing model, and therefore, component life can only be predicted relative to a reference life. The tool is demonstrated with an analysis of the F100-PW-220 engine 3rd stage turbine rotor blade life consumption during a recorded RNLAF F-16 mission. Using the engine system model with a detailed control system, deterioration effects on engine performance were analyzed and the effect of engine deterioration on blade life consumption rate was determined. The tool has significant potential to enhance on-condition maintenance and optimize aircraft operational use.

IN order that a flight engineer can give maximum help in maintaining safety when in the air, it is desirable that he should have full data as to the conditions in every cylinder of every engine in his charge.

This research paper focuses on the assessment of the optimal solution of the twin crisis of fossil fuels and environmental degradation. This research paper focuses on engine performance and emission analysis. In order to tackle this problem, an experimental investigation of constant speed and varying load have been performed on a single cylinder spark ignition engine by using different blends of gasoline and pure gasoline fuel. The parameters taken into consideration are brake specific fuel consumption, energy-specific fuel consumption and brake thermal efficiency. The analysis was also made the basis of carbon monoxide, hydrocarbons, carbon-di-oxide and NOx emissions. The outcomes were evaluated by comparison with baseline fuel neat Gasoline. The results indicated that alcoholic fuels in neat form increase the brake thermal efficiency and are optimal alternate fuels to be utilized. Keywords: Brake specific energy consumption, Brake specific fuel consumption, Brake thermal efficiency, Gasoline Cite this Article Manish Saraswat, Nathi Ram Chauhan. Performance and Emission Analysis of Different Alcoholic-Blended Fuels in Spark-Ignition Engines. Journal of Alternate Energy Sources and Technologies. 2018; 9(2): 15–32p.

An aircraft mission performance module has been developed in NPSS that allows for a collaborative environment for analysis of engine and aircraft mission performance. This model would provide a level of aircraft performance analysis that could be easily customized and exchanged between companies. The model is modular and allows easy integration of the aircraft aerodynamics, mass properties, and any other vehicle specific inputs into a standardized NPSS aircraft element. It also allows for a customizable run input interface that can integrate user input of mission segments, maneuvers, loadings, etc. This model was demonstrated on cases for analyzing different types of flight segments, technology assessment, and engine fault analysis. The creation of modular mission elements allows for quick creation of either standard or custom missions for analysis as well as plug and play capability with native NPSS models. The generic interface between the mission and vehicle make it easy to integrate a variety of engine and airframe models, including models that are not NPSS-based.

Exhaust emissions and engine performance analysis of a marine diesel engine fuelledwith Parinari polyandra biodiesel–diesel blends

Comparative performance analysis of combined-cycle pulse detonation turbofan engines (PDTEs)

The introduction of alternative fuels is beneficial to overcome the fuel shortage and reduce engine exhaust emissions. LPG and CNG are relatively clean fuel and considered as most promising alternative automotive fuels worldwide because of its emission reduction potential and lower fuel price compared to gasoline. Now a day’s adaptation of dual fuel approach is the growing as common trend. The two fuels can be successfully implemented with existing gasoline engine with little modification. The present study was done to analyze the performance and emissions analysis of a multi cylinder spark ignition engine fuelled with the benefits of CNG and LPG aseffective alternate automotive fuels by simply using them in an unmodified petrol engine. The test results indicate, the energy content of CNG and LPG is the most limiting factor in acceptance for fuel economy and performance reasons. Thermal efficiency was high for CNG lowest for gasoline and LPG between the two. BSFC, CO and HC were low and NOx was high for CNG and low for gasoline, LPG lies between the two.

The production of sorghum seeds produces sorghum stalks as solid waste that has potential to be used as raw material for biogas production. The largest composition of biogas produced from fermentation is methane gas (CH4) and carbon dioxide gas (CO2). The main component contained in biogas is CH4 or methane gas which is suitable for fuel. In this case, the problems studied were how the performance of vehicle engines by utilizing biogas from sorghum raw materials. With the existing problems, it is expected that we can find out how the performance of vehicle engines is when using biogas. The advantage of biogas compared to fossil fuels is that it is environmentally friendly and renewable. This research was conducted to find out the performance of vehicles by varying its air fuel ratio (AFR) between biogas and air. Based on the results and analysis, it can be found that the maximum torque produced when using Biogas was 6.4 Nm with AFR 1: 4 at 4,500 rpm and the maximum torque produced when using gasoline was 7.8 Nm at 2nd gear 1,500 rpm but the use biogas can produce the same torque if AFR chance to 1:8 with the value of about 7.8 Nm at 2nd gear 1,500 rpm. The maximum power generated when using Biogas was 4.1 hp with AFR 1: 8 at 4,500 rpm and the maximum power generated when using gasoline is 5.5 hp at 3rd gear at 6,000 rpm. The minimum SFC produced when using biogas was 1.4 kg/kWh with AFR 1: 8 at 4,500 rpm and the minimum SFC produced when using gasoline was 0.03 kg/kWh in 3rd gear.

This paper deals with the performance and emission analysis of a multicylinder diesel engine using biodiesel along with an in-depth analysis of the engine heat losses in different subsystems followed by the energy balance of all the energy flows from the engine. Energy balance analysis allows the designer to appraise the internal energy variations of a thermodynamic system as a function of ‘‘energy flows” across the control volume as work or heat and also the enthalpies associated with the energy flows which are passing through these boundaries. Palm and coconut are the two most potential biodiesel feed stocks in this part of the world. The investigation was conducted in a four-cylinder diesel engine fuelled with 10% and 20% blends of palm and coconut biodiesels and compared with B5 at full load condition and in the speed range of 1000 to 4000 RPM. Among the all tested blends, palm blends seemed more promising in terms of engine performance, emission, and heat losses. The influence of heat losses on engine performance and emission has been discussed thoroughly in this paper.

The performance and emission from diesel engine using biodiesel from waste coconut oil (WCOO) with and without additives is accessed in this article. WCOO biodiesel is produced from coconuts which are not favorable to be consumed by humans due to degradation. B20, B40, B50, and B100 biodiesel blends of WCOO are prepared and performance and emission testing are done. B20 blend of biodiesel is added with 5%, 10%, and 15% of 1-hepatanol and the tests are repeated. Then, B20 is added with 5% of 1-hepatnol, n-butanol, and iso-butanol as additive and separate analysis for each additive in B20 is carried out in similar way. The injection pressure was kept constant at 225 bar throughout these experiments. Later, B20, B40, B50, and B100 blends of WCOO are used separately for engine performance and emission behavior at 175 injection pressure without adding any additive. Brake specific fuel consumption (BSFC) and brake thermal efficiency are the factors analyzed during engine performance analysis and CO, CO2, HC, and NO x exhaust are recorded during emission analysis. From the comparative study, the engine performance of diesel is seen to be better than any other combination of biofuels at both the pressures. Among blends without additive, B20 performed better than other blends, B20 with n-butanol performed better than B20 without additive, while B20 with iso-butanol did not show any significant advantage. At 175 bar injection pressure 7.5% extra BSFC and approximately 16% more emission is obtained than at 225 bar pressure.

Analysis of combustion characteristics, engine performance and exhaust emissions of diesel engine fueled with upgraded waste source fuel

This study provides systematic computational analysis of turbojet and turbofan propulsion system performance and emissions characteristics using simulation modeling developed in Python programming language. Simulations were carried out using pyCycle software developed by NASA with the capability to simulate thermodynamic cycles of propulsion systems. Design-point and parametric analysis were also conducted to investigate the impact of major parameters like the compressor pressure ratio and turbine inlet temperature on engine performance. The model of turbojet and turbofan were created with component-level accuracy including the compressor, combustor, turbine, fan, and nozzle modules. The models were solved to convergence with state-of-the-art nonlinear solver algorithms interfaced with OpenMDAO. Results indicate that the turbofan engine achieves significantly higher thrust and greater fuel efficiency than the turbojet, with a 69.5% improvement in thrust and a 54.9% reduction in thrust-specific fuel consumption (TSFC) at the design point. Computation of emissions was conducted from calculated fuel mass flow rates and considering CO₂ production. The results indicate that the turbofan engine produces 13% less CO₂ per hour and nearly 49% less CO₂ per unit of thrust than the turbojet, validating the environmental benefits of high-bypass turbofan configurations. The study confirms the applicability of Python-based simulation frameworks for accurate propulsion system performance and emissions prediction. Future work will focus on incorporating alternative fuel models and predictive NOₓ emission calculations to expand the environmental impact assessment capabilities.

A modular approach to the study of system performance and thermodynamic cycle efficiency of airbreathing pulse detonation engines (PDEs) is described. Each module represents a specific component of the engine, and its dynamic behavior is formulated using conservation laws in either one or two spatial dimensions. A framework is established for assessing quantitatively the influence of all known processes on engine dynamics. Various loss mechanisms limiting the PDE performance are identified. As a specific example, a supersonic PDE for high-altitude applications is studied comprehensively. The effects of chamber configuration and operating sequence on the engine propulsive efficiency are examined. The results demonstrate the existence of an optimum cycle frequency and valve close-up time for achieving maximum performance in terms of thrust and specific impulse. Furthermore, a choked convergent-divergent nozzle is required to render the PDE competitive with other airbreathing propulsion systems, such as gas-turbine and ramjet engines.

Performance and emission analysis of hydrogen fueled compression ignition engine with variable water injection timing

The Fossil fuels play an important role in the world energy market. The World Energy Outlook claims that energy generated from fossil fuels will remain the major source. Population of the world increases day by day and living standard of the people will improve, there will be a shortage of source of energy. So researchers are continuously trying to find out the best alternative fuel. As an alternative fuel, Bio fuel required for becoming the fuel source for the future. With the use of Bio fuel there is no more modification is required in Existing engine. This study shows the comparison of performance and emission characteristics of diesel engine using diesel and biodiesel as palm seed oil with various proportions by volume (B10, B20, and B30). And in this research paper we briefly discuss replacement of fossil fuel with palm seed oil and diesel and its effect on the engine performance and emission characteristics.