I think a philosophical approach is always present at the core of research. We pretend to discover truth and create knowledge. But not always the philosophical approach is explicit on a paper or we do not include it in our methodology (mostly the practical papers).
I think a philosophical approach will always enrich the analysis and discussion of your research.
There is such a thing as Philosophical Inquiry which is different from empirical research. The two types of study are organized to occur separately. Here are descriptions of types of philosophical inquiries - https://p4chawaii.org/wp-content/uploads/PI-10-Lenses-of-PI-Research-Project-3.0.pdf.
If you look at abortion, for example. If you wanted to study the ethics of having an abortion, you would use philosophical inquiry. If you wanted to study the number of abortions, the types that occur, the outcomes and so forth, you would use empirical approaches. One of the dangers of using philosophy in empirical research is the tendency to only look at data that supports a philosophical view. It is generally better to keep them separate.