4. An engine operating on the air standard heat engine has a heat rejection at constant volume rate of 525 KJ/kg of air used. The minimum pressure and temperature are 98 Kpa and 339 K, respectively. If the bore and stroke of 75mm x 82mm, with cycle efficiency of 56% under heat addition, according to PV^ = C where n = 0. Determine • The maximum temperature and pressure • The amount of air used • The work for the cycle %3D

4. An engine operating on the air standard heat engine has a heat rejection at constant volume rate of 525 KJ/kg of air used. The minimum pressure and temperature are 98 Kpa and 339 K, respectively. If the bore and stroke of 75mm x 82mm, with cycle efficiency of 56% under heat addition, according to PV^ = C where n = 0. Determine • The maximum temperature and pressure • The amount of air used • The work for the cycle %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A steady-flow system operating on the ideal Ericsson cycle can achieve the Carnot efficiency. One of the salient features of this cycle is the isothermal expansion through a heated turbine, as shown in Fig. a. Heat is added to the turbine such that the outlet temperature is equal to the inlet temperature, i.e. T₁=T₂, and the overall pressure ratio for this process is rₚ=P₁/P₂. However, an isothermal expansion through a heated turbine is very difficult to achieve in practical engineering applications. An alternate approach is two use a multi-stage expansion process with reheating. In this approach, the gas expansion process is carried out in multiple stages with reheating in between each stage. Consider the two-stage turbine expansion with reheating shown in Fig. b. The gas enters the first stage of the turbine at state A1, is expanded isentropically to an intermediate pressure Pₐ₂, is reheated at constant pressure to state B1, and is expanded in the second stage isentropically to the…
A turboprop aircraft propulsion engine operates where the air is at 8 psia and −10°F, on an aircraft flying at a speed of 600 ft/s. The Brayton cycle pressure ratio is 10, and the air temperature at the turbine inlet is 940°F. The propeller diameter is 10 ft and the mass flow rate through the propeller is 20 times that through the compressor. Determine the thrust force generated by this propulsion system. Assume ideal operation for all components and constant specific heats at room temperature.
For a Rankine cycle, increasing maximum temperature while holding all other parameters constant will allow an engineer to make the following statements Group of answer choices Quality at the turbine exit will decrease increasing liquid water content and causing turbine erosion. Quality at the turbine exit will increase and improve turbine durability. Increasing maximum temperature increases the average temperarture at which heat is added and will increase thermal efficiency Increasing maximum tempearture will decrease required mass flow rate for a specified power output.
Air enters the compressor of a regenerative gas-turbine engine at 100 kPaand 300 K and is compressed to 800 kPa. The regenerator has aneffectiveness of 65 percent, and the air enters the turbine at 1200 K. For acompressor efficiency of 75 percent and a turbine efficiency of 86 percent,determine(a) The heat transfer in the regenerator.(b) The back work ratio.(c) The cycle thermal efficiency
A 3.6 liter, 4 cylinder engine with a compression ratio of 12 operates on an airstandard constant volume combustion cycle (with specific heat ratio, k=1.35). Theconnecting rod length-to-crank offset ratio is 4. The maximum cycle temperature andpressure are 2400 K and 10000 kPa. The engine is operating at 3000 rpm. The exhaustvalve opens at 45° bBDC for blowdown to an exhaust pressure of 94 kPa. Determinethe average mass flow rate of the exhaust gas during the blowdown period, in kg/s.
A gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and the turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1250 K. The compressor and the turbine efficiencies are 80% and 82%, respectively, and the effectiveness of the regenerator is 74%. Assuming variable specific heats for air; show the process in a T-s diagram; calculate the back work ratio; and determine the thermal efficiency of the cycle.
Determine the thermal efficiency of a simple rankine cycle.
In a single stage impulse turbine the isentropic enthalpy drop of 200 kJ/kg occurs in the nozzlehaving efficiency of 96% and nozzle angle of 15°. The blade velocity coefficient is 0.96 and ratio ofblade speed to steam velocity is 0.5. The steam mass flow rate is 20 kg/s and velocity of steam enteringis 50 m/s. Determine(a) the blade angles at inlet and outlet if the steam enters blades smoothly and leaves axially.(b) the blade efficiency(c) the power developed in kW(d) the axial thrust.Solve using velocity diagram please use the symbols below
First you selected a gas-turbine power plant operating on an ideal Brayton cycle and according to the manufacturing datasheets it has the following specifications:• A pressure ratio of 10. • Heat is added to the cycle at a rate of 500 kW• Air passes through the engine at a rate of 1 kg/s• The air at the beginning of the compression is at 70 kPa and 0 C.Task 1Investigate the principles of operation for a gas turbine power plant by considering the following:1. Construct T-S and P-V diagrams while discussing the operation of a gas turbine power plant2. Describe the difference between closed and open gas turbine engine3. Explain how a closed gas turbine engine would be combined with a steam power plant. 4. Explain why Brayton cycle is more preferred over Rankin cycle in power plant stations? And how would you enhance the performance of a Brayton cycle?
1.) The ratio of the pressures in an Ericsson Cycle is 8. Determine the Thermal Efficiency in % 2.) The compression ratio of a Stirling Cycle is 11. What is the thermal efficiency in %? 3.) The compression ratio of a Stirling Cycle is 4. Heat is rejected at 90C. What is the highest temperature in the cycle in Celcius? ANSWER SHOULD BE ROUND OFF IN SIX SIGNIFICANT FIGURES
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats with temperature. 1)Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines 2)Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines
Draw schematic diagrams of a gas turbine system used for i. generating electricity with irreversible (actual) single stage compression, ii. two stages of irreversible expansion with reheat, and iii. a regenerator. Specify the relevant corner points of the process.