Answer the following questions fully 1:41 AM P Z O ·E. VIE.11 2412.12.23hich runs at 18 r/s, has a boreA single stage, single acting air compressdiameter of 205 and a stroke length of 250 mm. the clearance volume is 5% ofthe stroke volume and the polytropic index of compression is 1,32. The intakeconditions are 80 kPa and 28 °C and the delivery pressure is 650 kPa.Calculate the following:2.1.12.1.22.1.32.1.4The volumetric efficiency at the intake conditionsThe volumetric efficiency referred to free air delivery of 101,3 kPaand 16 °CThe delivery temperature in kelvinThe effective volume per minuteWhat is the main function of a compressor?(2)[15]GN W(4)☐

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Answered: 1:41 AM P Z O · E. VIE.11 241 2.1 2.2 3…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A single stage single acting air compressor with runs at speed 600 rpm. It has a polytropic index of 1,26. The induced volume flow rate is 0,72 cubic meters per min and the air must be delivered at a pressure of 707 KPa. The free air conditions are 101,3 KPa and 15 degrees Celsius. The clearance volume is 7,6 % of the stroke volume and the stroke /bore ratio is 1,6/1. Calculate 1.The stroke volume of the cylinder in cubic meters to 5 decimal places. 2.The bore of the piston in meter to 4 decimal places.
3.11) The conditions of air at the entry of an axial compressor stage are: Рi %3D 768 тт Hg & Ti = 314 K. The air angles are B1 = 51°, B2 = 9°, a1 = az = 7°. The mean diameter 50 ст. The peripheral speed 100 m/s. Mass-flow rate 25 kg/s work done factor 0.95 mechanical efficiency 92 % stage efficiency 88 % (a) Air angle at the stator entry, [a2 50.18°] (b) Blade height at entry and the hub-tip diameter ratio, [h, = 19 cm ; dn/d = 0.449] (c) Stage loading coefficient. [V = 0.754] (d) Stage pressure ratio. [Po3/Po1 1.075] (e) The power required to drive the stage. [Power = 204.75 kW]
You 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%.
5. Air entering at 70°F and atmospheric pressure is to be compressed to 4000 Ib/in² gauge in a reciprocating compressor at the rate of 125 std ft /min. How many stages should be used? What is the theoretical shaft work per standard cubic foot for frictionless adiabatc compression? What is the brake horsepower if the efficiency of each stage is 85 percent? For air y = 1.40.? What is the discharge temperature of the air from the first stage?
A single-stage, single-acting air compressor running at 1000 rev/min delivers air at 2.5 MPa bar. For this purpose the induction and free air conditions can be taken as 1 atm and 15 °C, and the FAD as 0.25 m³/min. The clearance volume is 3% of the swept volume and the stroke/bore ratio is 1.2/1. Determine; (i) the bore and stroke; the swept volume, Vs; the delivery temperature, T2; the volumetric efficiency; the indicated power; and the isothermal efficiency.
26: A petrol engine has a carburettor of 32 mm venturi size. The jet diameter is 2mm. The pressure difference at throat is 50 mm of Hg The atmosphericit to Pressure is 1 bar and temperture 27°C. The coefficient of discharge for venture is 0.85 and for fuel jet o.66. The density of petrol is 750 kg/m³. Nozzle lip is Zero Relative density of Hg 13.6 Find. waily wat The fuel velocity, fuel flow (mp), air velocity and air flow, F/A, neglecting lant Compressibility. aldatzi zit Repeat the question taking Compressibility into account. to b Answers [4.25 m/s.0.006515 Kg/sec, 107.2 m/s, 0.0851 kg/s To bud No apagail 10.0766 video tu 200108.7 m/sec, 0.0822 Kg/s, 0.0793]a plovila
c. A single-acting air compressor has a clearance volume of 10%. Air is received at 90 kPaand 293 K and is discharged at 600 kPa. The compression and re-expansion curve arepolytropic with n = 1.28. The pressure drops are 5 kPa and 10 kPa at the suction anddischarge ports, respectively. The compressor piston displacement is 490 cm3 whenoperating at 900 rpm. Determine the mass of air compressed in kg/hr.
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Q88 Atest carried out on a single cylinder, twa-stroke oil engine gave the following datag Cylinder bore =200 mm, stroke 250 mm, engine speed-300 rpm, net brake torque 500N.m indicated mean effective Pressure =4.9×10°N/m2,fuel consumption = 5kg/min, Cooling water rate of flow - o0666 kg/sec, temperature rise of cooling water=55k, specific heat capacity of water =4.1868 Kilkg-k. Calculate:@the mechanical efficiency O the specific fuel consumption, and © draw up an energy balance in kw. Answers EO 81.6,60.318 kg/kw.hr,©Qtotal -61a1Kw , n Qb.p=15.7Kwg@cooling water= 15.35 kw ,QExhaust= 30.05 kw]
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A single – stage air compressor has a cylinder bore of 0.1m, a stroke of 0.075m and a clearance factor of 0.05. The conditions within the cylinder during suction which are identical to those of the environment are 0.1 Mpa and 300K . The compression and expansion index is 1.3. Calculate; a) The mass delivery rate b) The power required c) The volumetric efficiency d) The isothermal efficiency
A single acting, twin cylinder, Ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to produce 700 kW of refrigeration at -18°C evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kJ. The specific volume of vapor entering the compressor is 0.592 m³ per kilogram. Assume 85% volumetric efficiency, determine the bore in mm. A. 400 mm С. 450 mm В. 300 mm D. 500 mm

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