# internal combustion homework help

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• Q1:Problem 1 Otto Cycle (60 points) Use an air-standard Otto cycle to model a 4-cylinder engine. At the beginning of compression, the cylinder volume is 0.55L, the pressure is 98 kPa, and the temperature is 290 K. Copyright © 2023 Scott D Sawyer. All rights reserved. This material may not be reproduced, distributed, transmitted, displayed, published, or broadcast, in whole or in part, without the prior written permission of Scott D Sawyer. Any unauthorized use of this material is a violation of copyright law and will be pursued to the limit of civil and criminal penalties. At the end of compression, the cylinder volume is 0.046L. The temperature at the end of the combustion process is 2700 K. Use the specific heat ratio k = 1.4, and gas constant R = 287; kg.K Draw a schematic of the cylinder showing the volume at TDC, BDC, and displacement. Draw the cycle on T-s diagram Identify the 4 processes of the cycle Determine: (a) The compression ratio (b) The engine displacement (c) The temperature at the end of compression T₂ (d) The specific heat input qu (kJ/kg) (e) The temperature at the end of the power stroke T4 (f) The specific heat loss q (kJ/kg) (g) The specific work per cycle Wnet (kJ/kg) (h) The mass of air in the cylinder (kg) (i) The power produced by the engine at 8,500 rpmSee Answer
• Q2:Problem 2 Simple propulsion cycle Jumo 004 (90 points) Given engine design parameters: • Compressor pressure ratio 3.14 ● Compressor isentropic efficiency 74% • Turbine inlet temperature 1050K ● Turbine isentropic efficiency 82% Inlet air flow rate 23.5 kg/s ● ● Cruise condition 205 m/s at 3 km altitude on a standard day Copyright © 2023 Scott D Sawyer. All rights reserved. This material may not be reproduced, distributed, transmitted, displayed, published, or broadcast, in whole or in part, without the prior written permission of Scott D Sawyer. Any unauthorized use of this material is a violation of copyright law and will be pursued to the limit of civil and criminal penalties. Draw the cycle on a T-s diagram Identify the process in the cycle Calculate the pressure and temperature for the following states: (a) Freestream condition (Ta, Pa) (b) The compressor inlet (T₁, P₁) (c) The compressor ideal exit condition (T25, P₂)See Answer
• Q3:Problem 3 Gas Mixtures (50 points) A gas mixture with mass fractions of C4H10 butane (6.11%), oxygen (21.88%), and nitrogen (72%) is compressed in a piston-cylinder device during the compression stroke of an ideal Diesel cycle. Copyright © 2023 Scott D Sawyer. All rights reserved. This material may not be reproduced, distributed, transmitted, displayed, published, or broadcast, in whole or in part, without the prior written permission of Scott D Sawyer. Any unauthorized use of this material is a violation of copyright law and will be pursued to the limit of civil and criminal penalties. The initial volume of the cylinder is 0.5L, and the initial conditions are 95kPa and 290K. The engine compression ratio is 22. (a) the mole fractions of the components (b) the molar mass of the mixture (c) the gas constant for the mixture (d) the specific heat ratio for the mixture (hint k-Cp/Cv) (e) the mass of the mixture in the cylinder (f) the temperature at the end of the compression process (g) the work done on the mixture during the compression process (kJ) *There's no value of Cp for Butane in our text. Please use Cp = 1.7164 kJ/kg KSee Answer
• Q4:Problem 4 Psychrometrics (40 points) A flow of air (350 cfm) enters an automotive A/C unit at 14.7 psia, 104°F and 50% relative humidity is cooled to 55°F. Copyright © 2023 Scott D Sawyer. All rights reserved. This material may not be reproduced, distributed, transmitted, displayed, published, or broadcast, in whole or in part, without the prior written permission of Scott D Sawyer. Any unauthorized use of this material is a violation of copyright law and will be pursued to the limit of civil and criminal penalties. (a) Draw a schematic of the system Determine: (b) the mass flow rate of dry air for at the inlet (c) the rate of heat removed in (Btu/hr) (d) the rate of liquid water condensation (if any, in lbm/hr) *If you use a psychrometric calculator, please include screenshots that show your workSee Answer
• Q6:1.1. Learning Outcomes 1. By the end of the lab, the student will be able to: identify the major parts of a Honda GX160 (IC Engine, link to MECH109 year 1). 2. Identify the processes of the Otto cycle. 3. Perform an engine test over a range of speeds and for two different throttle settings. 4. Explain the effect of key engine parameters on performance: spark advance, speed, load, valve timing and throttle setting. 5. Calculate basic performance measurements from collected data. 6. Analyse, plot and fit data (review MECH113 learning resources in CANVAS for support). 7. Draw conclusions on engine performance from plotted data.See Answer
• Q8:Description of Assessment Task and Purpose: The Initial Assessment Form will be used as the basis for planning your work over the coming academic year. You should refer back to this document in order to monitor your own progress. In preparing the Initial Assessment Form, you are making a commitment that you will deliver a number of objectives within a specified timescale. For this reason, it is vital that you agree what these objectives and timescales are with your supervisor as soon as possible. The purpose of the Initial Assessment Form is: • To demonstrate that you understand the context and purpose of your project • To agree a list of formal objectives and deliverables with your supervisor • To develop and communicate an initial project plan i.e. a work breakdown structure supported by a Gantt chart or timelineSee Answer
• Q9: 3)PARAMETRIC: Liquid octane (C8H18) at 298 K & 1 atm enters a well-insulated combustion chamber and burns with air. For steady-state operation and assuming complete combustion, plot the following: a) Products temperature vs. % theoretical air (100% - 400%), if air enters at constant 298 K. b) Products temperature vs. inlet-air temperature (298-600 K) at constant 120% theoretical air. See Answer
• Q10: PARAMETRIC: An ICE is tested with liquid octane (C8H18). The air-intake system is being tuned over the range of 70% - 130% theoretical air. Both fuel and air enter at 298 K, and the exhaust leaves at 700 K. All hydrogen in the fuel is assumed to burn to H₂O at all times. Heat transfer from this engine is just equal to the work done by the engine. Plot the following parameters vs. % theoretical air: a)The power output of the engine [kW], if it burns 18 kg/h of fuel. b) The CO emission [ppm].5See Answer
• Q11: In an internal combustion (IC) engine working on a dual combustion cycle, the temperature of the working fluid(air) at the beginning of the compression process is 25°C. The compression ratio is 15 and the pressure ratio's 1.58. The amounts of heat added at constant volume and at constant pressure are equal. Develop an excel file to calculate the temperatures across the cycle and the thermal efficiency. Graph the total amount of heat in as a function of the inlet temperature if the inlet-temperature varies from 0°C to 25°C.See Answer
• Q12: \bar{h}_{f}^{0}=-352000 \mathrm{~kJ} / \mathrm{kmol} Determine the HHV and LHV of diesel fuel, which can be approximated by dodecane (C12H26) withh = -352000 kJ/kmol.See Answer

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