1- Air to fuel ratio 2- Exhaust nozzle pressure 3- The velocity of the exhaust jet
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- Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the firstturbine until it is just dry saturated, then it is re-heated to 400 °C and expandedthroughthe second-stage turbine. The condenser pressure is 0.04 bar what is the pressure in bar at state 4 to 3 decimal places? what is the specific entropy in kJ/kg-K for state 5 to 4 d.p.?(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd Carnot cycle Он TH Tc - V 02016 Pearson Education, Inc. processes: processes and segment ab & cd are the Where segments ad & bc are the and the volumes involved are Va, Vb, Vc, Vd, and the two temperatures TC andYou have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. .Inlet Conditions TO2 Poz Core Air Mass Flowrate (kg/s) (K) (kPa) 282 24.6 47.0 Design Constraints Maximum Polytropic Efficiency 94.1% Maximum Stage Pr 1.55 Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.
- You have invented a hydrogen‐fueled turbine engine that operates between a combustion temperature of 2500. K and an exhaust manifold temperature of 500. K. How much work does it produce per kilojoule of fuel energy if it operates at 75% of maximum theoretical efficiency?A turbine engine air intake is at pressure and temperature of air drawn 99 kPa and 29 °C respectively. The maximum pressure and temperature during the cycle is 990 kPa and 888 °C respectively. The adaibatic index as 1.4. After claculations, the pressure ratio of the cycle is compressor exit temperature is K, turbine exit temperature is K, net specific work output from the gas turbine engine is in k thermal efficiency_ is % and work ratio of the cycle is to I decimal place.Steam enters a control yolume that has one inlet and two exits. At the inlet (location 1) with a diámeterof 5.2 cm, the Steam has 100 bar , 360°C , and as mass flow rate of a Rg/sec. Through one exit (location 2), 15.% of the incoming mass flow rate Teaves the Control volume and the remainder leaves through the otner exit (locatión 3). For steady state opeaton, calculake the mass flow rate at locatlon 3 in kg/sec using 5 Signifigant figiures. रप्री द
- Exercise We consider an ideal Diesel Cycle whose compression ration The heat transfer to the motor fluid from 18 = Vmin At the start of and the temperature is 15°C~ We the neglect which is assimilated Compression the air pressure Ft to the Narvation of composition of the contents in moles of a perfect = 1.80 MJ.xg diatomic gas (Ideal gos) of mass Determine the pressures Pa as well as the temperatures T2, T3, Tp. WEEng Nmin is 1.00 bar Express temper T₁, T₂, T3, Ty and d. Numerical Application (M = 29 g mul~) Comment on 1-2 reversible adiabatic compression (isentropic) 2 +3 fuel Injection and Combustion 34 reversible adiabatic expansion (isen tropic) Cooling of perfect l' deal) gases. Isochoric erature of this cycle as a function of Imax M = 2.M Please answer the above question step-wise, showing explanations, Including diagrams where nee Decessary. Thanks in adland 3 PA 3 Y 21 Vmin JA Imax PVQuestion B3 The engine of an aeroplane is equipped with an ideal convergent nozzle with an area ratio Ainlet 2.035 ( -A-2.035), as in Figure Q-B3. The aeroplane is flying at an altitude of 11 Aexit km where the atmospheric pressure and temperature are 0.23 bar and 216K respectively. You may assume the combustion gases entering the nozzle have the same property as air (i.e. y=1.40, R=287 J/kgK and Cp-1004.5J/kgK). Page 6 Question B3 continued inlet exit Amles/Aexit -AVAJ-2.035 Figure Q-B3 a) If the nozzle operates at its critical condition, calculate: the inlet Mach number M;. nozzle's exit velocity V, the inlet stagnation pressure Por- the inlet static pressure FG The stagnation Aj P, and the nozzle's gross thrust per unit exit area temperature of the gases entering the nozzle is To 1200 K. b) If the stagnation pressure at the inlet of the nozzle is reduced to 80% of its value in part (a), determine the exit static temperature 7;, the nozzle's gross thrust per unit exit area FG. The…COMBUSTION ENGINEERING In an air-standard Otto cycle engine, the following data were obtained: k = 1.4 , C, = 1.0045 ,C, = 0.7175 , P1 = 103 kPa , t, = 26°C, t2 = 414°C, tz = 2527°C, kgK kg-K t4 = 945.8°C. To be done: a. Find the compression ratio r. A. 6,5 В. 7 C. 7.5 D. 8.0 E. None of these b. Find the pressure at the end of the compression stroke p2. А. 1804 КРа В. 1894 КРа С. 1994 КPа D. 2004 КРа c. Find the pressure at the end of heat addition. A. 7700 kPa B. 7719 kPa C. 8019 kPa D. 8800 kPa E. None of these d. Find the pressure at the end of the expansion stroke P4. A. 410 kPa В. 420 kPa C. 8019 kPa D. 460 kPa E. None of these e. Find the Heat added qa to the cycle, in kJ/kg air. A. 1615 kJ/kg C. 1555 kJ/kg E. None of these B. 1575 kJ/kg D. 1516 kJ/kg f. Find the work of the cycle wey, in kJ/kg air. A. 866.1- kg air B. 877.1 k) kg air C. 880.2- D. 900- E. None of these kg air E. None of these kg air Page 1 of 2 g. Calculate the cycle efficiency for the cycle, in percent. A. Ncy =…
- In actual 4 stroke engine cycle, combustion chamber pressure at the end of exhauststroke is greater than the atmospheric pressure and the pressure of the intake port onaverage is less than the atmospheric pressure. In theory, early opening of the intakevalve before the TDC should not result with fresh air getting inside the combustionchamber. However in actual applications,intake valve is opened 20 ~ 40 ᵒ CA beforethe TDC (Intake valve opening advance), inorder to increase the fresh air transfer intothe combustion chamber. Explain howintake valve opening advance increasesfresh air transfer into the combustionchamber.Q/ Mention 10 applications of internal combustion engines?Title A simple, constant pressure gas turbine is designed for a pressure ratio of 5 to 1, and a turbine... Description A simple, constant pressure gas turbine is designed for a pressure ratio of 5 to 1, and a turbine inlet temperature of 550°C. The adiabatic efficiency of compressing is 80% and that of expansion 85%, and there is a pressure loss of 0.0343bar through the combustion chamber. Calculate (a) the power per kg of air per sec. (b) the overall efficiency. Assuming the air to enter at 15°C and 1.01 bar. Take k = 1.4 and Cn = 1.047 for both air and combustion gases. Neglect the additional mass flow due to the fuel