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首页> 外文会议>ASME international conference on energy sustainability >A COMPARISON BETWEEN THE MONTE CARLO RAY TRACE AND THE FLUENT DISCRETE ORDINATES METHODS FOR TREATING SOLAR INPUT TO A PARTICLE RECEIVER
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A COMPARISON BETWEEN THE MONTE CARLO RAY TRACE AND THE FLUENT DISCRETE ORDINATES METHODS FOR TREATING SOLAR INPUT TO A PARTICLE RECEIVER

机译：蒙特卡罗射线迹线与流质离散准则对粒子接收器进行太阳输入处理的方法的比较

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A new type of high temperature solar receiver for Brayton Cycle power towers is being designed and built in the Combustion and Solar Energy Laboratory at San Diego State University under a DOE Sunshot Award. The Small Particle Solar Receiver is a pressurized vessel with a window to admit concentrated solar radiation that utilizes a gas-particle suspension for absorption and heat transfer. As the particles absorb the radiation that enters the receiver through the window, the carrier fluid (air in this case) heats which oxidizes the particles and the flow leaves the receiver as a clear gas stream. After passing through an in-line combustor if needed, this hot gas is used to power a turbine to generate electricity. The numerical modelling of the receiver is broken into three main pieces: Monte Carlo Ray Trace (MCRT) method (written in FORTRAN), ANSYS Fluent (CFD), and the User Defined function (written in C code) for oxidation. Each piece has its advantages, disadvantages, and limitations and the three pieces are coupled to finalize the calculation. While we have successfully demonstrated this approach to obtaining the velocity and temperature fields, one big challenge to this method is that the definition of the geometry is a time consuming programming task when using MCRT. On the other hand, arbitrary geometries can be easily modelled by Computational Fluid Dynamics (CFD) codes such as FLUENT. The goal of this study is to limit the use of MCRT method to determining the appropriate input boundary condition on the outside of the window of the receiver and to use the built-in Discrete Ordinates (DO) method for all the radiation internal to the receiver and leaving the receiver due to emission. To reach the goal, this paper focuses on the DO method implemented within FLUENT. An earlier study on this subject is based and advanced. Appropriate radiation input for the DO method is extensively discussed. MIRVAL is used to simulate the heliostat field and VEGAS is used to simulate a lab-scale solar simulator; both of these codes utilize the MCRT method and provide intensity information on a surface. Output from these codes is discretized into DO parameters allowing the solution to proceed in FLUENT. Suitable benchmarks in FLUENT are used in a cylindrical geometry representing the receiver for the comparison and validation. This method will allow FLUENT to be used for a variety of problems involving concentrated solar energy.
机译：圣地亚哥州立大学燃烧与太阳能实验室正在设计和建造一种用于布雷顿循环发电塔的新型高温太阳能接收器，并获得了DOE Sunshot奖。小颗粒太阳能接收器是一种带有窗口的加压容器，该窗口可以吸收集中的太阳辐射，该辐射利用气体颗粒悬浮液进行吸收和热传递。当颗粒吸收通过窗口进入接收器的辐射时，载液（在这种情况下为空气）加热，该氧化液会氧化颗粒，并且气流以透明气流的形式离开接收器。如果需要，在通过直列燃烧器后，这些热气体将用于为涡轮机提供动力以发电。接收器的数值建模分为三个主要部分：蒙特卡洛雷迹线（MCRT）方法（用FORTRAN编写），ANSYS Fluent（CFD）和用户定义的函数（用C代码编写）进行氧化。每一部分都有其优点，缺点和局限性，并且将这三部分结合起来以完成计算。虽然我们已经成功地演示了这种获取速度和温度场的方法，但此方法的一大挑战是使用MCRT时，几何的定义是一项耗时的编程任务。另一方面，可以通过计算流体动力学（CFD）代码（例如FLUENT）轻松地对任意几何图形进行建模。这项研究的目的是限制使用MCRT方法来确定接收器窗口外部的适当输入边界条件，并对接收器内部的所有辐射使用内置的离散正交（DO）方法并由于发射而离开接收器。为了实现该目标，本文重点介绍在FLUENT中实现的DO方法。对此主题的早期研究是基础和先进的。 DO方法的适当辐射输入已得到广泛讨论。 MIRVAL用于模拟定日镜场，VEGAS用于模拟实验室规模的太阳模拟器。这两个代码都利用MCRT方法，并在表面上提供强度信息。这些代码的输出被离散化为DO参数，从而使解决方案可以在FLUENT中进行。 FLUENT中合适的基准用于表示接收器的圆柱几何体中，以进行比较和验证。这种方法将使FLUENT可以用于涉及聚光太阳能的各种问题。

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