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Propeller Thrust and Torque Increasing

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Old   August 12, 2018, 14:08
Exclamation Propeller Thrust and Torque Increasing
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Good Day everyone,

I am running open water test on my propeller but unfortunately my result of thrust coefficient and torque coefficient show increasing graphs. I have been working on the directions of torque and thrust but it doesn't help. Experts can give some suggestions which part to work on?

My propeller:
negative RPM with axis (1,0,0)
negative inlet velocity
zero outlet pressure
thrust direction (-1,0,0)
torque direction (1,0,0)

At first I was running using the setting exactly the same as in user guide except the way I created the interface but my result was wrong too. I got my torque and thrust coefficient as decreasing graph but negative value. I was trying to imitate or follow all the setting as in example so I have no idea which part had gone wrong.

Last edited by KindaHungry; August 12, 2018 at 14:28. Reason: extra information
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Old   November 3, 2018, 06:59
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Hi I have found the problem to this issue.
The thing is I was using a propeller with pitch ratio P/D 0.8065 but I obtaining result data from J=0.8 to J=1.2.

For pitch ratio 0.8065, the torque coefficient, thrust coefficient will increase from low J until around approximately J=0.7 and starts to drop after that and the value can keep dropping to negative values. So what I did was I obtained date from J=0.1 to J=0.8 and the problem is solved.
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