What can be ignored when making energy balance for an adiabatic gas turbine?

Question

BlackTom AI · Accepted Answer

When performing an energy balance for an adiabatic gas turbine, we focus on the primary energy transfers involved in converting chemical or thermal energy into shaft work, while keeping track of what can be neglected to simplify the model.
Option a: change of gravitational potential energy. In many gas-turbine analyses, the turbine is treated as a system with negligible vertical height change between inlet and outlet, so the potential energy term (m g z) is small compared to the flow work and enthalpy terms. Therefore, for many practical engineering calculations, the change in gravitational potential energy is ignored without significantly impacting accuracy.
Option d: heat losses. By definition, an adiabatic process involves no heat transfer across the system boundary, i.e., Q = 0. In an ideal adiabatic gas turbine, external heat losses are neglected, and the energy balance does not include a heat loss term. In real systems, there may be small unavoidable heat losses, but in the idealized adiabatic assumption they are ignored to simplify the model.
If one were to question the remaining energy terms, the core components typically considered are inlet and outlet enthalpy (or internal energy) and shaft work, along with any potential changes in kinetic energy if flow speeds change significantly. Misconceptions to watch for include treating heat losses as significant in an adiabatic model, or assuming large altitude changes where gravitational potential could become non-negligible. Similarly, assuming that all energy changes go into shaft work without accounting for losses would be an incomplete energy balance, even in adiabatic conditions.
In summary, both the change in gravitational potential energy and heat losses are commonly neglected in the ideal adiabatic gas-turbine energy balance, which aligns with standard simplifying assumptions used in first-order analyses.

What can be ignored when making energy balance for an adiabatic gas turbine?多项选择题

类似问题

The change of internal energy of formation can usually be neglected in energy balance, if

The change of internal energy of formation can usually be neglected in energy balance, if

You own a bond that pays $64 in interest annually. The face value is $1,000 and the current market price is $1,021.61. The bond matures in 11 years. What is the yield to maturity?

Which of the following statements is CORRECT?

It will cost $9,600 to acquire an ice cream cart that is expected to produce cash inflows of $3,600 a year for three years. After the three years, the cart is expected to be worthless. What is the payback period?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单