Flow induced vibrations in heat exchanger tube arrays

热交换器管阵列中的流动引起的振动

• 批准号: 8284-2006
• 负责人: Weaver, David
• 金额: $ 3.2万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=389717
• 关键词: Flow; induced; vibrations; heat; exchanger

When a flexible structure is exposed to a high velocity flowing fluid, the stucture is induced to vibrate.  If these vibrations are excessive, structural failure may occur.  A familiar example is spectaclar collapse of the Tacoma Narrows Bridge.  The proposed research examines the vibrations of power or chemical plant heat exchanger tubes caused by liquid, gas or steam flows. The objective is to understand the fluid forces which cause the vibrations and thereby, to develop methods for designing against damaging vibrations.  The particular applications are related to improving performance and reliability of heat exchangers, condensers and steam generators in power (nulcear and fossil) and chemical process plants.    Heat exchanger tubes are often long and flexible and may be induced to vibrate excessively by fluid flowing across them.  In the case of nuclear steam generators, this can cause a leak of heavy water from the core of the reactor.  The proposed research will help in developing an understanding of the conditions which lead to damaging tube vibration.  The results will assist the development of design codes which ensure the reliability of heat exchangers in service or of analysis codes for predicting the reliability of aging equipment.     One of the projects involves heat exchanger tubes with fins used to enhance heat transfer.  The fins appear to enhance flow instability in tube arrays and little information currently exists for design against such problems.

当柔性结构暴露在高速流动的流体中时，结构就会产生振动。如果这些振动过大，结构可能会发生破坏。一个熟悉的例子是塔科马海峡大桥壮观的倒塌。拟议的研究考察了由液体、气体或蒸汽流动引起的电力或化工厂热交换器管的振动。目的是了解引起振动的流体力，从而开发出防止破坏性振动的设计方法。具体的应用涉及改善热交换器、冷凝器和蒸汽发生器在电力（核能和化石）和化学加工厂的性能和可靠性。热交换器管通常是长而灵活的，并且可能被流过它们的流体引起过度振动。在核蒸汽发生器的情况下，这可能导致重水从反应堆的核心泄漏。提出的研究将有助于发展的条件，导致破坏性的管振动的理解。研究结果将有助于制定确保在役换热器可靠性的设计规范或预测老化设备可靠性的分析规范。其中一个项目涉及带翅片的热交换器管，用于加强传热。翅片似乎增加了管阵列中的流动不稳定性，目前针对此类问题的设计信息很少。