the compressor. Assume an inlet [6] At a particular operating condition an axial flow compressor has a reaction of 0.6 a flow coefficient of 0.5 and a stage loading, defined as AholU2 of 0.4. If the flow exit angles for each blade row may be assumed to remain unchanged when the mass flow is throttled, determine the reaction of the stage and the stage loading when the air flow is reduced by 10% at constant blade speed. Sketch the velocity triangles for the two conditions.
the compressor. Assume an inlet [6] At a particular operating condition an axial flow compressor has a reaction of 0.6 a flow coefficient of 0.5 and a stage loading, defined as AholU2 of 0.4. If the flow exit angles for each blade row may be assumed to remain unchanged when the mass flow is throttled, determine the reaction of the stage and the stage loading when the air flow is reduced by 10% at constant blade speed. Sketch the velocity triangles for the two conditions.
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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Number 6
![5.4
[5] A 15-stage axial flow compressor is to have a pressure ratio of 6. Tests have
shown that a stage total-to-total efficiency of 0.9 can be obtained for each of the
first six stages and 0.89 for each of the remaining ten stages. Assuming constant
work done in each stage and similar stages find the compressor overall total-to-
total efficiency. For a mass flow rate of 45 kg/s determine the power required by
the compressor. Assume an inlet total temperature of 289 K.
55
[6] At a particular operating condition an axial flow compressor has a reaction of
0.6. a flow coefficient of 0.5iand a stage loading, defined as AholU2 of 0.4. If the
flow exit angles for each blade row may be assumed to remain unchanged when
the mass flow is throttled, determine the reaction of the stage and the stage
loading when the air flow is reduced by 10% at constant blade speed. Sketch the
velocity triangles for the two conditions.
[7] With help of drawing write shortly about:
a) Velocity diagrams for the axial compressor stage.
b) Mollier diagram (h-s diagrams) for the axial compressor stage.
c) Velocity diagrams for reactions greater and less than 50%.
d) Simplified off-design performance curve of a compressor stage (stage
loading, w, as a function of flow coefficient, ¤)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb9f8d680-ff35-4049-867a-1284e61d67ed%2F0d90213a-f16c-4b70-872a-0df36d875d8d%2Fp1svtnp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:5.4
[5] A 15-stage axial flow compressor is to have a pressure ratio of 6. Tests have
shown that a stage total-to-total efficiency of 0.9 can be obtained for each of the
first six stages and 0.89 for each of the remaining ten stages. Assuming constant
work done in each stage and similar stages find the compressor overall total-to-
total efficiency. For a mass flow rate of 45 kg/s determine the power required by
the compressor. Assume an inlet total temperature of 289 K.
55
[6] At a particular operating condition an axial flow compressor has a reaction of
0.6. a flow coefficient of 0.5iand a stage loading, defined as AholU2 of 0.4. If the
flow exit angles for each blade row may be assumed to remain unchanged when
the mass flow is throttled, determine the reaction of the stage and the stage
loading when the air flow is reduced by 10% at constant blade speed. Sketch the
velocity triangles for the two conditions.
[7] With help of drawing write shortly about:
a) Velocity diagrams for the axial compressor stage.
b) Mollier diagram (h-s diagrams) for the axial compressor stage.
c) Velocity diagrams for reactions greater and less than 50%.
d) Simplified off-design performance curve of a compressor stage (stage
loading, w, as a function of flow coefficient, ¤)
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