Example 26.13 An axial-flow compressor draws air at 20°C and delivers it at 50°C. Assuming 50% reaction, calculate the velocity of flow, if blade velocity is 100 m/s, work factor is 0.85. Take C₂ = 1 kJ/kg K, Assume Cp 10°, and B = 40°. Find the number of stages. a =

Example 26.13 An axial-flow compressor draws air at 20°C and delivers it at 50°C. Assuming 50% reaction, calculate the velocity of flow, if blade velocity is 100 m/s, work factor is 0.85. Take C₂ = 1 kJ/kg K, Assume Cp 10°, and B = 40°. Find the number of stages. a =

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

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a. Assume a blower operating at 4000 rpm compressing air from 68°F and 14.7psia to 8.5psig, handling 16000cfm at the design point with an efficiency of 70%. It is desired to find the operating conditions (BHP, H and Q) at 3600 rpm. b. Same as problem (a) except assume that the speed and inlet temperature remains the same, but the inlet pressure at the point considered, drops to 10psia. c. Same as problem (a) except assume that the speed and inlet pressure remains the same, but the inlet temperature rises to 100°F.
Problem 7.1 A roots blower is used to deliver air 100kg/min. The pressure ratio through blower is 2 to 1. The conditions of air at suction is 1.013 bar and 50°C. Caculate the power required to drive the blower.
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9.2 The inlet stagnation temperature of a centrifugal compressor rotating at 10,000 rpm is 20°C. The inlet flow is axial and the blades are radially tipped at the exit. It is required to produce a stagnation pressure ratio of 2.8 when the total to total effi- ciency is 0.85. It has 19 blades and a mass flow rate of 3.0 kg/s. Through measure- ments, the density of air at the exit of the impeller is found to be 1.5 kg/m³. The width of the blades at the exit is 1 cm. Calculate the following: (a) power required to drive the compressor, (b) diameter of the impeller, and (c) absolute Mach num- ber at the exit. Use Stanitz's equation for the slip coefficient. Ans: 355 kW; 0.694 m; 0.897
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A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft:a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4b. Compute the heat added (QA), heat rejected (QR), work (W) and the cycle efficiency (e).c. for a rate of circulation of 1000 cfm, compute the horsepower
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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
The last 3 parts B,D,E