Deshmukh Nilaj, Ansari Afzal, Kumar Praseed, George Allen Varghese, Thomas Febin Joseph, George Merick Steve
Department of Mechanical Engineering, Fr. C. Rodrigues Institute of Technology, Sector- 9A, Vashi, Navi Mumbai 400703, India.
MethodsX. 2023 Mar 12;10:102123. doi: 10.1016/j.mex.2023.102123. eCollection 2023.
Thermoacoustic instabilities present in the combustor of power producing devices are having adverse effects on the performance. To avoid thermoacoustic instabilities, design of control method is very much essential. Design and development of a closed loop control method is a real challenge for combustor. Active control methods are advantageous than passive methods. The characterization of thermoacoustic instability is essential for effective design of control method. The selection of appropriate controller and it's design depends on characterization of thermoacoustic instabilities. In this method the feedback signal acquired from microphone is used to control the flow rate of radial micro-jets. The developed method is implemented effectively to suppress thermoacoustic instabilities in a one dimensional combustor (Rijke tube). The airflow to the radial micro-jets injector was controlled using a control unit which consist of a stepper motor coupled with a needle valve, and an airflow sensor. Radial micro-jets are used to break a coupling and act as an active closed-loop method. The control method used radial jets effectively to control the thermoacoustic instability and reduces sound pressure level to background level (100 dB to 44 dB) in short span of time (10 Second).•LabVIEW Interface for Arduino (LIFA), LabVIEW, and DAQ are very useful in developed closedloop active control method.•Developed closed loop active control method is very effective for suppression of thermoacoustic instability.•Developed closed loop active control method used air in the form micro jets to control thermoacoustic instabilities.
发电设备燃烧室中存在的热声不稳定性对性能产生不利影响。为避免热声不稳定性，控制方法的设计非常关键。闭环控制方法的设计与开发对燃烧室而言是一项真正的挑战。主动控制方法比被动方法更具优势。热声不稳定性的特性描述对于控制方法的有效设计至关重要。合适控制器的选择及其设计取决于热声不稳定性的特性描述。在这种方法中，从麦克风获取的反馈信号用于控制径向微喷管的流量。所开发的方法在一维燃烧室（里吉克管）中得到有效实施，以抑制热声不稳定性。通过一个由与针阀相连的步进电机和一个气流传感器组成的控制单元来控制流向径向微喷管喷射器的气流。径向微喷管用于打破耦合，作为一种主动闭环方法。该控制方法有效地利用径向喷管控制热声不稳定性，并在短时间（10秒）内将声压级降低到背景水平（从100分贝降至44分贝）。•用于Arduino的LabVIEW接口（LIFA）、LabVIEW和数据采集卡（DAQ）在已开发的闭环主动控制方法中非常有用。•已开发的闭环主动控制方法对抑制热声不稳定性非常有效。•已开发的闭环主动控制方法利用微喷管形式的空气来控制热声不稳定性。
