Recent content by Langbein

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    Why does anything exist than rather nothing ?

    Unless it should not happen that "time" itself in some way is the basis for all existence and that all existence can only be "performed" as present in and related to "time". If so: "Why does anything exist all and rather nothing ?" Because of the only platform for observation that is possible...
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    Why does anything exist than rather nothing ?

    Well, I think in 1853 I did not exist to much, while in 2008 I did exist some more. I think the question of time is an interesting part of it because time is connected to changes trough basic laws of physics. Let's say delta s = v * delta t, a change of posistion along a line is the product...
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    Why does anything exist than rather nothing ?

    But if to "exist" has something to do with "interact" then to "exist" has to do something with with "time". Nothing can interact without moving or traveling trough the dimension of time, can it ? But where does this refference point for time come from ? Why is "now" now and not tomorrow or...
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    Why does anything exist than rather nothing ?

    As a starter of this tread, I have followed it and I can see that there has been a lot of interresting comments and arguments. I think an other interesting way of twisting the question arount a little bit is to ask: What will it then mean to exist ? What does it mean that something does...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    [post deleted by Russ] I'm sorry to have to do this because I know you are putting a real effort into it, but you are completely wrong here and you're just going to confuse the OP. Fred is an industry professional and a resident guru in this particular subject, but you don't need to be to...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    Well, I think he got a long and well explained answer. In the end I think we agree .. allmost :-)
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    By the way, I will try to se if I can get up the picture you sendt before. https://www.physicsforums.com/attachment.php?attachmentid=10253&d=1181648089 If you see the area after the compressor, you can see it is formed as a nozzele. The pressure curve is not accurate because it should show...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    OK, I did, do the same before, but not any more. (Does some other technology stuff now.) Used to do F-100/F16 O/H and test drive in teststand and installed on aircraft before. (Worked as a F-16 test engineer) Later on civilian with helicopter and aircraft turbine engines. But back to the...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    Well, I think I'm right. What kind of engine(s) do you test on ? What was the test conditions ? How do you check what happens inside the combustion chamber ? Did you dissassembly the engine to take a look at the different details ? Did you then reassemble it, testrun it to send it...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    The p-v diagram of a jet engine menetioned in wikipedia would not be that one you would use if you got an F-16 engine up in the test bed to make a test run. The p-v diagram of wikipedia leaves out a few details, I think. One detail that is left out is that the front diffusor of the combustion...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    Remember that the combustion chamber consist of "two halves": 1. The area outside the internal cobustion liner, that will work allmost as you mention. (Exept for that you have not mentioned the diffusor zone between the compressor area and the combustion chamber, that will increase the static...
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    Jet Engine Doubt: How Does Temp & Pressure Affect Efficiency?

    No, I don't think it will work like that. The gas stream trough a combustion chamber does not follow the Bernoulli's equitation at all. This prinsipple will only be valid when the airstream has one fixed amount of energy. In the case of the combustion chamber you add on a lot of burning fuel...
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    Aerodynamics of HAWTs: Understanding Angle of Attack

    By the way, the emergency control system of some jet turbine propeller engines does the same. If some critical condition is reached then the propeller blades just "feather".
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    Aerodynamics of HAWTs: Understanding Angle of Attack

    "My guess would be that wind turbines are designed for a specific range of speeds. Just like on a sailboat, then, if they start to exceed the optimal wind speed, they feather (luff) the prop to bleed-off energy so they don't snap the blades off (roll the boat)." I think that's right. At least...
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    Things that a mechanical engineer must know for sure

    I think I should need to have such a degree in social engineering as well. I have heard that this degree MSE - can be something rather expeceve to obtain. Does anybody know a web based university or something where the Master of Social Engineering can be obtained for some slightly less...
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