 鲜花( 97)  鸡蛋( 4)
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发表于 2023-2-23 09:55
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It's been tried a few times, both in racing and in passenger cars (or at the very least a prototype of a passenger car was made). The main reasons they've fallen out of favor are operability and maintainability.' E5 L6 f" n8 T0 X0 B. q
# ~3 V3 b( @: c) M, b v4 hTurbine engines are indeed very efficient at their design speed, but the problem is they aren't nearly as efficient when operating off their design speed. In a car that is frequently accelerating and decelerating, it is difficult to reap the efficiency benefits. Adding to the trouble is the fact that turbine engines are not particularly quick to respond. When a demand for more power is requested by the operator (I.e. you want to accelerate), the engine controller must add fuel very carefully, which means the engine doesn't speed up very quickly. If fuel is added too quickly, the turbine can over-temp, which burns up the blades and reduces the rotor life, or it can produce an excessive amount of torque that could fail one of the internal shafts of the turbine or possibly something downstream in the drive train. Excessive cases of this can result in catastrophic engine failure. This is an especially large risk if the load from the engine is suddenly removed.* \3 F9 s) c" m, A% U
7 t/ ~+ [& c3 uThe second is an issue of maintainability. Turbines are notoriously expensive to operate and repair. The life of many internal components is heavily influenced by usage, making it difficult to predict the life of the turbine rotors. Turbine rotors are very expensive to replace, so you wouldn't want to replace them too early, but if they fail before you get a chance to replace them, then the engine is likely totaled. Americans especially tend to shun maintenance, and turbines would be an especially bad fit for American consumers. q6 ]( K% H. k" A" `
* R0 o9 Q9 j ~8 ?- U& LI believe a turbine powered car actually won the Indy 500 decades ago, as that application avoided most of the pitfalls I just described - the car was operating at wide open throttle for basically the entire race minus a few pit stops and maintenance costs are much less of a concern for racing teams. If I remember correctly, use of turbines was outlawed in the Indycar series shortly thereafter.
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发表于 2023-2-17 15:44
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