【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191029
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Question: What is residual velocity loss? How to reduce residual velocity loss? There are no answers provided for this series of posts; fellow netizens may share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
Steam exits the driven blades at a certain velocity; this exhaust steam possesses kinetic energy, which is not utilized in this stage and is referred to as excess velocity loss. Installing inlet guide vanes, using counter-rotating turbines, as well as co-axial twin turbines are all effective solutions for reducing residual velocity losses
The steam discharged from the last stage of the turbine still has a certain velocity. This loss of energy is called residual velocity loss.
The steam discharged from the last stage of the turbine still has a certain velocity. This loss of energy is called residual velocity loss. The use of multi-stage turbines can reduce residual velocity losses.
The steam discharged from the last stage of the turbine still has a certain velocity. This loss of energy is called residual velocity loss. The use of multi-stage turbines can reduce residual velocity losses.
Remaining velocity loss refers to the fact that when steam exits the rotor blades, it still possesses a certain absolute velocity; the exhaust gas from the rotor blades takes away some of this kinetic energy, which is what is known as remaining velocity loss. Methods to reduce the speed loss: In the case of a single-stage turbine, it is difficult to make use of this excess speed loss. However, in order to minimize such losses, a multi-stage turbine can be used, as when the steam flow moves from one stage to the next in a multi-stage turbine, part or all of its kinetic energy can be effectively utilized by the subsequent stage. This reduces the residual speed loss of the turbine and improves its efficiency. It should be noted, however, that in multi-stage turbines, the residual speed energy of the last stage and the control stage cannot be utilized.
The unutilized steam kinetic energy remaining after the steam passes through the last stage of the moving blades is referred to as residual velocity loss. Reducing residual velocity loss: With a constant steam flow rate, the larger the exhaust area, the lower the residual velocity and thus the smaller the residual velocity loss. Therefore, to reduce residual velocity losses, longer last-stage turbine blades are required to increase the exhaust area.
Remaining velocity loss refers to the fact that when steam exits the rotor blades, it still possesses a certain absolute velocity; the exhaust gas from the rotor blades takes away some of this kinetic energy, which is what is known as remaining velocity loss. In the case of a single-stage turbine, it is difficult to make use of this excess velocity loss. However, in order to reduce such losses, a multi-stage turbine can be used, as when the steam flow moves from one stage to the next in a multi-stage turbine, part or all of its kinetic energy can be effectively utilized by the subsequent stage. This reduces the residual speed loss of the turbine and improves its efficiency. It should be noted, however, that in multi-stage turbines, the residual speed energy of the last stage and the control stage cannot be utilized.
Steam exits the driven blades at a certain velocity; this exhaust steam possesses kinetic energy, which is not utilized in that stage and is referred to as excess velocity loss. In the case of a single-stage turbine, it is difficult to make use of this excess velocity loss. However, in order to reduce such losses, a multi-stage turbine can be used, as when the steam flow moves from one stage to the next in a multi-stage turbine, part or all of its kinetic energy can be effectively utilized by the subsequent stage. This reduces the residual speed loss of the turbine and improves its efficiency. It should be noted, however, that in multi-stage turbines, the residual speed energy of the last stage and the control stage cannot be utilized.
Steam exits the driven blades at a certain velocity; this exhaust steam possesses kinetic energy, which is not utilized in that stage and is referred to as excess velocity loss.