Answer :
To estimate the pressure ratio of each stage in the ge90-85b engine with a total of 14 compression stages, we can divide the overall compression ratio by the number of stages.
The overall compression ratio is 39.3, and there are 14 stages. So, the pressure ratio of each stage would be 39.3 divided by 14, which is approximately 2.807.
If the stage pressure ratio could be increased by 4%, we can calculate the new compression ratio of a 14-stage compressor. First, we need to calculate the increased pressure ratio of each stage. We can increase the original pressure ratio of 2.807 by 4%, which gives us an increased pressure ratio of 2.919. To find the new compression ratio, we multiply the increased pressure ratio by the number of stages, which is 14. So, the new compression ratio would be 2.919 multiplied by 14, which is approximately 40.867.
If the stage compression ratio were to be increased by 4% and the overall pressure ratio were kept fixed at 39.3, we need to determine how many stages would be needed. We can calculate the increased pressure ratio of each stage by multiplying the original pressure ratio of 2.807 by 1.04 (4% increase), which gives us an increased pressure ratio of approximately 2.920. To find the number of stages needed, we divide the overall pressure ratio of 39.3 by the increased pressure ratio of each stage (2.920). The result is approximately 13.50. Since we can't have half a stage, we would need 14 stages in this scenario as well.
The ge90-85b engine and compression ratios, you can refer to relevant aerospace engineering or jet engine design resources.
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