Drop interaction with solid surfaces upon impact has been attracting a growing community of researchers who are focusing more and more on ‘complex’ surfaces and ‘complex’ drops. Recently, we are observing an emerging research trend related to the investigation of compound drop impact. Compound drops consist of two or more distinct continuous phases sharing common interfaces, surrounded by a third phase. Examples are core–shell and Janus drops. In this review, we address the fundamental aspects of compound drop impact and discuss the current challenges related to experimental testing and numerical simulation of multiphase fluid systems. Furthermore, we provide a perspective on the technological relevance of understanding and controlling compound drop impact, ranging from 3D printing to liquid separation for water cleaning and oil remediation.

液滴在撞击后与固体表面的相互作用吸引了越来越多的研究人员，他们越来越关注“复杂”的表面和“复杂”的液滴。最近，我们正在观察与化合物滴滴影响研究相关的新兴研究趋势。复合液滴由共享公共界面的两个或多个不同的连续相组成，被第三相包围。例如核壳和Janus滴剂。在这篇综述中，我们讨论了化合物滴落影响的基本方面，并讨论了与多相流体系统的实验测试和数值模拟相关的当前挑战。此外，我们提供了有关理解和控制化合物滴落影响的技术相关性的观点，从3D打印到用于水清洗和油污修复的液体分离，应有尽有。